LeOSium_webview/LeOS/patches/bromite-build-utils.patch

From: uazo <uazo@users.noreply.github.com>
Date: Fri, 9 Jun 2023 15:11:46 +0000
Subject: bromite build utils

---
 build/android/gyp/java_cpp_enum.py            | 36 +++++--
 build/android/gyp/util/build_utils.py         | 25 ++++-
 build/bromite/bromite_utils.gni               | 69 ++++++++++++++
 build/bromite/gyp/cpp_bromite_include.py      | 35 +++++++
 build/bromite/gyp/cpp_bromite_include.pydeps  |  9 ++
 build/bromite/gyp/java_bromite_impl.py        | 94 +++++++++++++++++++
 build/bromite/gyp/java_bromite_impl.pydeps    |  9 ++
 build/config/BUILDCONFIG.gn                   |  1 +
 build/config/android/rules.gni                |  6 +-
 .../ChromeAccessibilitySettingsDelegate.java  |  5 +
 chrome/browser/flags/BUILD.gn                 | 10 +-
 .../flags/android/cromite_native_utils.cc     | 27 ++++++
 .../flags/android/cromite_native_utils.h      | 14 +++
 .../browser/flags/CromiteNativeUtils.java     | 32 +++++++
 tools/grit/grit/grd_reader.py                 | 27 +++++-
 tools/grit/preprocess_if_expr.py              | 32 ++++++-
 16 files changed, 415 insertions(+), 16 deletions(-)
 create mode 100644 build/bromite/bromite_utils.gni
 create mode 100644 build/bromite/gyp/cpp_bromite_include.py
 create mode 100644 build/bromite/gyp/cpp_bromite_include.pydeps
 create mode 100644 build/bromite/gyp/java_bromite_impl.py
 create mode 100644 build/bromite/gyp/java_bromite_impl.pydeps
 create mode 100755 chrome/browser/flags/android/cromite_native_utils.cc
 create mode 100755 chrome/browser/flags/android/cromite_native_utils.h
 create mode 100755 chrome/browser/flags/android/java/src/org/chromium/chrome/browser/flags/CromiteNativeUtils.java

diff --git a/build/android/gyp/java_cpp_enum.py b/build/android/gyp/java_cpp_enum.py
--- a/build/android/gyp/java_cpp_enum.py
+++ b/build/android/gyp/java_cpp_enum.py
@@ -173,6 +173,7 @@ class DirectiveSet:
 
 
 class HeaderParser:
+  include_re = re.compile(r'#include "(.*)"')
   single_line_comment_re = re.compile(r'\s*//\s*([^\n]*)')
   multi_line_comment_start_re = re.compile(r'\s*/\*')
   enum_line_re = re.compile(r'^\s*(\w+)(\s*\=\s*([^,\n]+))?,?')
@@ -194,7 +195,7 @@ class HeaderParser:
   enum_single_line_re = re.compile(
       r'^\s*(?:\[cpp.*\])?\s*enum.*{(?P<enum_entries>.*)}.*$')
 
-  def __init__(self, lines, path=''):
+  def __init__(self, lines, options, path=''):
     self._lines = lines
     self._path = path
     self._enum_definitions = []
@@ -204,6 +205,7 @@ class HeaderParser:
     self._generator_directives = DirectiveSet()
     self._multi_line_generator_directive = None
     self._current_enum_entry = ''
+    self._options = options
 
   def _ApplyGeneratorDirectives(self):
     self._generator_directives.UpdateDefinition(self._current_definition)
@@ -227,6 +229,24 @@ class HeaderParser:
       raise Exception('Multi-line comments in enums are not supported in ' +
                       self._path)
 
+    # handles the management of #include files
+    include_line = HeaderParser.include_re.match(line)
+    if include_line:
+      include_file = include_line.groups()[0];
+      if not include_file.endswith(".inc"):
+        raise Exception('Include file \"' + include_file + '\" must ends with .inc')
+
+      file_to_include = os.path.join(self._options.gen_dir, include_file)
+      if not os.path.exists(file_to_include):
+        file_to_include = os.path.join(self._options.root_dir, include_file)
+      lines = []
+      with open(file_to_include) as include_file_handle:
+        lines = include_file_handle.readlines()
+
+      for new_line in lines:
+        self._ParseEnumLine(new_line)
+      return
+
     enum_comment = HeaderParser.single_line_comment_re.match(line)
     if enum_comment:
       comment = enum_comment.groups()[0]
@@ -327,9 +347,9 @@ class HeaderParser:
         self._ParseSingleLineEnum(single_line_enum.group('enum_entries'))
 
 
-def DoGenerate(source_paths):
+def DoGenerate(source_paths, options):
   for source_path in source_paths:
-    enum_definitions = DoParseHeaderFile(source_path)
+    enum_definitions = DoParseHeaderFile(source_path, options)
     if not enum_definitions:
       raise Exception('No enums found in %s\n'
                       'Did you forget prefixing enums with '
@@ -342,9 +362,9 @@ def DoGenerate(source_paths):
       yield output_path, output
 
 
-def DoParseHeaderFile(path):
+def DoParseHeaderFile(path, options):
   with open(path) as f:
-    return HeaderParser(f.readlines(), path).ParseDefinitions()
+    return HeaderParser(f.readlines(), options, path).ParseDefinitions()
 
 
 def GenerateOutput(source_path, enum_definition):
@@ -423,6 +443,10 @@ def DoMain(argv):
   parser.add_option('--srcjar',
                     help='When specified, a .srcjar at the given path is '
                     'created instead of individual .java files.')
+  parser.add_option('--gen_dir',
+                    help='Indicates the path to the generated file')
+  parser.add_option('--root_dir',
+                    help='Indicates the path to the build root')
 
   options, args = parser.parse_args(argv)
 
@@ -432,7 +456,7 @@ def DoMain(argv):
 
   with action_helpers.atomic_output(options.srcjar) as f:
     with zipfile.ZipFile(f, 'w', zipfile.ZIP_STORED) as srcjar:
-      for output_path, data in DoGenerate(input_paths):
+      for output_path, data in DoGenerate(input_paths, options):
         zip_helpers.add_to_zip_hermetic(srcjar, output_path, data=data)
 
 
diff --git a/build/android/gyp/util/build_utils.py b/build/android/gyp/util/build_utils.py
--- a/build/android/gyp/util/build_utils.py
+++ b/build/android/gyp/util/build_utils.py
@@ -499,4 +499,27 @@ def ReadSourcesList(sources_list_file_name):
   Note that this function should not be used to parse response files.
   """
   with open(sources_list_file_name) as f:
-    return [file_name.strip() for file_name in f]
+    files = [file_name.strip() for file_name in f]
+    # allows inclusion of all files in the indicated folder
+    # in the sources of java-related gn targets.
+    # "include_all_directory.java" is a special name and must exist in the
+    # folder since gn checks for its existence, but it will not be
+    # included in the list.
+    # example:
+    #
+    #   sources += [
+    #     "java/src/org/chromium/components/browser_ui/site_settings/impl/include_all_directory.java",
+    #   ]
+    #
+    # will include in source all files found in
+    #   "java/src/org/chromium/components/browser_ui/site_settings/impl"
+    include_dirs = [f for f in files if f.endswith('include_all_directory.java')]
+    for include_file in include_dirs:
+      directory = os.path.dirname(include_file)
+      for root, dirs, directory_files in os.walk(directory):
+        for directory_file in directory_files:
+          files.append(os.path.join(directory, directory_file))
+      files = [f for f in files if not f.endswith('include_all_directory.java')
+                               and not f.endswith('.java.tmpl')]
+
+    return files
diff --git a/build/bromite/bromite_utils.gni b/build/bromite/bromite_utils.gni
new file mode 100644
--- /dev/null
+++ b/build/bromite/bromite_utils.gni
@@ -0,0 +1,69 @@
+import("//build/config/python.gni")
+
+# generates the file specified in ouput_file containing
+# the inclusion of all .inc files found in the folder
+# specified
+#
+# Parameters
+#   directories (required)
+#       A list of folders from which to extract the .inc files
+#
+#   output_file (required)
+#       The name of the include file to be generated
+#
+# Example
+#
+# cpp_bromite_include("bromite_content_settings") {
+#   directories = [ "bromite_content_settings/placeholder.txt" ]
+#   output_file = "bromite_content_settings.inc"
+# }
+#
+template("cpp_bromite_include") {
+  action_with_pydeps(target_name) {
+    forward_variables_from(invoker,
+                           TESTONLY_AND_VISIBILITY + [
+                                 "deps",
+                                 "inputs",
+                               ])
+    script = "//build/bromite/gyp/cpp_bromite_include.py"
+
+    _rebased_directories = rebase_path(invoker.inputs, root_build_dir)
+    _output = "$target_gen_dir/" + invoker.output_file
+    _output_rebased = rebase_path(_output)
+
+    args = [
+      "--output=$_output_rebased",
+    ]
+    args += _rebased_directories
+
+    outputs = [ _output ]
+  }
+}
+
+# allows the generation of the java file needed for
+# the inclusion of the defined site settings
+# in separate files
+# used by content settings patch
+template("java_bromite_impl") {
+  action_with_pydeps(target_name) {
+    forward_variables_from(invoker,
+                           TESTONLY_AND_VISIBILITY + [
+                                 "deps",
+                                 "inputs",
+                               ])
+    script = "//build/bromite/gyp/java_bromite_impl.py"
+
+    _srcjar_path = "${target_gen_dir}/${target_name}.srcjar"
+    _rebased_srcjar_path = rebase_path(_srcjar_path, root_build_dir)
+    _rebased_directories = rebase_path(invoker.inputs, root_build_dir)
+    _rebased_template = rebase_path(invoker.template, root_build_dir)
+
+    args = [
+      "--srcjar=$_rebased_srcjar_path",
+      "--template=$_rebased_template",
+    ]
+    args += _rebased_directories
+
+    outputs = [ _srcjar_path ]
+  }
+}
diff --git a/build/bromite/gyp/cpp_bromite_include.py b/build/bromite/gyp/cpp_bromite_include.py
new file mode 100644
--- /dev/null
+++ b/build/bromite/gyp/cpp_bromite_include.py
@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+
+import argparse
+import os
+import re
+import sys
+
+def _Main(argv):
+  parser = argparse.ArgumentParser()
+
+  parser.add_argument('--output',
+                      required=True,
+                      help='The path at which to generate the .inc file')
+
+  parser.add_argument(
+      'inputs', nargs='+', help='Input folder(s)', metavar='INPUTFILE')
+  args = parser.parse_args(argv)
+
+  for include_file in args.inputs:
+    directory = os.path.dirname(include_file)
+    files = []
+    for root, dirs, directory_files in os.walk(directory):
+      for directory_file in sorted(directory_files):
+        files.append(os.path.join(directory, directory_file))
+
+    files = [f for f in files if f.endswith('.inc')]
+
+  with open(args.output, 'w') as f:
+    for file in files:
+      f.write("#include \"" + file + "\"\n")
+    f.write("\n")
+
+
+if __name__ == '__main__':
+  _Main(sys.argv[1:])
diff --git a/build/bromite/gyp/cpp_bromite_include.pydeps b/build/bromite/gyp/cpp_bromite_include.pydeps
new file mode 100644
--- /dev/null
+++ b/build/bromite/gyp/cpp_bromite_include.pydeps
@@ -0,0 +1,9 @@
+# Generated by running:
+#   build/print_python_deps.py --root build/bromite/gyp --output build/bromite/gyp/cpp_bromite_include.pydeps build/bromite/gyp/cpp_bromite_include.py
+../../action_helpers.py
+../../android/gyp/util/__init__.py
+../../android/gyp/util/build_utils.py
+../../android/gyp/util/java_cpp_utils.py
+../../gn_helpers.py
+../../zip_helpers.py
+cpp_bromite_include.py
diff --git a/build/bromite/gyp/java_bromite_impl.py b/build/bromite/gyp/java_bromite_impl.py
new file mode 100644
--- /dev/null
+++ b/build/bromite/gyp/java_bromite_impl.py
@@ -0,0 +1,94 @@
+#!/usr/bin/env python3
+
+import argparse
+import os
+import re
+import sys
+import zipfile
+
+sys.path.append('build/android/gyp')
+sys.path.append('../../build/android/gyp')
+
+from util import build_utils
+from util import java_cpp_utils
+import action_helpers  # build_utils adds //build to sys.path.
+import zip_helpers
+
+def _GenerateOutput(template, source_paths, template_path, strings):
+  description_template = """
+// This following string constants were inserted by
+//     {SCRIPT_NAME}
+// Directory
+//     {SOURCE_PATHS}
+// Template
+//     {TEMPLATE_PATH}
+
+"""
+  values = {
+      'SCRIPT_NAME': java_cpp_utils.GetScriptName(),
+      'SOURCE_PATHS': ',\n//    '.join(source_paths),
+      'TEMPLATE_PATH': template_path,
+  }
+  description = description_template.format(**values)
+
+  import_clause = '\n'.join(
+      ['import org.chromium.components.browser_ui.site_settings.impl.' + f + ';' for f in strings])
+  add_clause = '\n\t'.join(['\tadd(new ' + f + '());' for f in strings])
+
+  values = {
+      'DESCRIPTION': description,
+      'ADD_CLAUSE': add_clause,
+      'IMPORT_CLAUSE': import_clause,
+  }
+  return template.format(**values)
+
+
+def _Generate(source_paths, template_path):
+  with open(template_path) as f:
+    lines = f.readlines()
+
+  template = ''.join(lines)
+  package, class_name = java_cpp_utils.ParseTemplateFile(lines)
+  output_path = java_cpp_utils.GetJavaFilePath(package, class_name)
+  strings = []
+
+  for directory in source_paths:
+    if not directory.endswith('include_all_directory.java'):
+      raise Exception("input path not ends with 'include_all_directory.java'")
+    for root, dirs, directory_files in os.walk(os.path.dirname(directory)):
+      for directory_file in sorted(directory_files):
+        strings.append(directory_file)
+
+  strings = [f.replace('.java', '') for f in strings
+             if not f.endswith('include_all_directory.java') and
+                not f.endswith('.java.tmpl') ]
+
+  output = _GenerateOutput(template, source_paths, template_path, strings)
+
+  return output, output_path
+
+
+def _Main(argv):
+  parser = argparse.ArgumentParser()
+
+  parser.add_argument('--srcjar',
+                      required=True,
+                      help='The path at which to generate the .srcjar file')
+
+  parser.add_argument('--template',
+                      required=True,
+                      help='The template file with which to generate the Java '
+                      'class.')
+
+  parser.add_argument(
+      'inputs', nargs='+', help='Input folder(s)', metavar='INPUTFILE')
+  args = parser.parse_args(argv)
+
+  with action_helpers.atomic_output(args.srcjar) as f:
+    with zipfile.ZipFile(f, 'w', zipfile.ZIP_STORED) as srcjar:
+      data, path = _Generate(args.inputs, args.template)
+      zip_helpers.add_to_zip_hermetic(srcjar, path, data=data)
+
+
+if __name__ == '__main__':
+  _Main(sys.argv[1:])
diff --git a/build/bromite/gyp/java_bromite_impl.pydeps b/build/bromite/gyp/java_bromite_impl.pydeps
new file mode 100644
--- /dev/null
+++ b/build/bromite/gyp/java_bromite_impl.pydeps
@@ -0,0 +1,9 @@
+# Generated by running:
+#   build/print_python_deps.py --root build/bromite/gyp --output build/bromite/gyp/java_bromite_impl.pydeps build/bromite/gyp/java_bromite_impl.py
+../../action_helpers.py
+../../android/gyp/util/__init__.py
+../../android/gyp/util/build_utils.py
+../../android/gyp/util/java_cpp_utils.py
+../../gn_helpers.py
+../../zip_helpers.py
+java_bromite_impl.py
diff --git a/build/config/BUILDCONFIG.gn b/build/config/BUILDCONFIG.gn
--- a/build/config/BUILDCONFIG.gn
+++ b/build/config/BUILDCONFIG.gn
@@ -652,6 +652,7 @@ set_defaults("component") {
   configs = default_component_configs
 }
 
+import("//build/bromite/bromite_utils.gni")
 # =============================================================================
 # ACTION OVERRIDE
 # =============================================================================
diff --git a/build/config/android/rules.gni b/build/config/android/rules.gni
--- a/build/config/android/rules.gni
+++ b/build/config/android/rules.gni
@@ -212,7 +212,7 @@ if (enable_java_templates && is_android) {
   #   }
   template("java_cpp_enum") {
     action_with_pydeps(target_name) {
-      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY + [ "sources" ])
+      forward_variables_from(invoker, TESTONLY_AND_VISIBILITY + [ "sources", "deps" ])
 
       # The sources aren't compiled so don't check their dependencies.
       check_includes = false
@@ -223,6 +223,10 @@ if (enable_java_templates && is_android) {
       _rebased_sources = rebase_path(invoker.sources, root_build_dir)
 
       args = [ "--srcjar=$_rebased_srcjar_path" ] + _rebased_sources
+      _root_gen_dir = rebase_path(root_gen_dir)
+      _root_dir = rebase_path(root_build_dir)
+      args += [ "--gen_dir=$_root_gen_dir",
+                "--root_dir=$_root_dir" ]
       outputs = [ _srcjar_path ]
     }
   }
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/accessibility/settings/ChromeAccessibilitySettingsDelegate.java b/chrome/android/java/src/org/chromium/chrome/browser/accessibility/settings/ChromeAccessibilitySettingsDelegate.java
--- a/chrome/android/java/src/org/chromium/chrome/browser/accessibility/settings/ChromeAccessibilitySettingsDelegate.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/accessibility/settings/ChromeAccessibilitySettingsDelegate.java
@@ -23,6 +23,11 @@ import org.chromium.components.browser_ui.site_settings.SiteSettingsCategory;
 import org.chromium.components.user_prefs.UserPrefs;
 import org.chromium.content_public.browser.BrowserContextHandle;
 
+import org.chromium.chrome.browser.flags.ChromeFeatureList;
+import org.chromium.chrome.browser.flags.CromiteNativeUtils;
+import org.chromium.chrome.browser.preferences.ChromePreferenceKeys;
+import org.chromium.chrome.browser.preferences.SharedPreferencesManager;
+
 /** The Chrome implementation of AccessibilitySettingsDelegate. */
 public class ChromeAccessibilitySettingsDelegate implements AccessibilitySettingsDelegate {
     private static class ReaderForAccessibilityDelegate implements BooleanPreferenceDelegate {
diff --git a/chrome/browser/flags/BUILD.gn b/chrome/browser/flags/BUILD.gn
--- a/chrome/browser/flags/BUILD.gn
+++ b/chrome/browser/flags/BUILD.gn
@@ -6,7 +6,8 @@ import("//build/config/android/rules.gni")
 import("//third_party/jni_zero/jni_zero.gni")
 
 android_library("java") {
-  sources = [
+  sources = [ "android/java/src/org/chromium/chrome/browser/flags/CromiteNativeUtils.java" ]
+  sources += [
     "android/java/src/org/chromium/chrome/browser/flags/AllCachedFieldTrialParameters.java",
     "android/java/src/org/chromium/chrome/browser/flags/BooleanCachedFieldTrialParameter.java",
     "android/java/src/org/chromium/chrome/browser/flags/CachedFieldTrialParameter.java",
@@ -42,7 +43,8 @@ android_library("java") {
 }
 
 generate_jni("jni_headers") {
-  sources = [
+  sources = [ "android/java/src/org/chromium/chrome/browser/flags/CromiteNativeUtils.java" ]
+  sources += [
     "android/java/src/org/chromium/chrome/browser/flags/ChromeFeatureMap.java",
     "android/java/src/org/chromium/chrome/browser/flags/ChromeSessionState.java",
   ]
@@ -50,6 +52,10 @@ generate_jni("jni_headers") {
 
 static_library("flags_android") {
   sources = [
+    "android/cromite_native_utils.cc",
+    "android/cromite_native_utils.h",
+  ]
+  sources += [
     "android/chrome_session_state.cc",
     "android/chrome_session_state.h",
   ]
diff --git a/chrome/browser/flags/android/cromite_native_utils.cc b/chrome/browser/flags/android/cromite_native_utils.cc
new file mode 100755
--- /dev/null
+++ b/chrome/browser/flags/android/cromite_native_utils.cc
@@ -0,0 +1,27 @@
+#include "chrome/browser/flags/android/cromite_native_utils.h"
+
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/flags/jni_headers/CromiteNativeUtils_jni.h"
+#include "components/flags_ui/pref_service_flags_storage.h"
+
+#include "base/android/jni_string.h"
+
+using base::android::JavaParamRef;
+
+static void JNI_CromiteNativeUtils_SetEnabled(JNIEnv* env,
+    const JavaParamRef<jstring>& featureName, jboolean isEnabled) {
+  flags_ui::PrefServiceFlagsStorage flags_storage(
+      g_browser_process->local_state());
+  std::set<std::string> entries = flags_storage.GetFlags();
+
+  auto internal_name = base::android::ConvertJavaStringToUTF8(env, featureName);
+  entries.erase(internal_name);
+  entries.erase(internal_name + "@1"); // enabled
+  entries.erase(internal_name + "@2"); // disabled
+
+  if (isEnabled)
+    entries.insert(internal_name + "@1");
+
+  flags_storage.SetFlags(entries);
+  flags_storage.CommitPendingWrites();
+}
diff --git a/chrome/browser/flags/android/cromite_native_utils.h b/chrome/browser/flags/android/cromite_native_utils.h
new file mode 100755
--- /dev/null
+++ b/chrome/browser/flags/android/cromite_native_utils.h
@@ -0,0 +1,14 @@
+#ifndef CHROME_BROWSER_FLAGS_ANDROID_CROMITE_NATIVE_UTILS_H_
+#define CHROME_BROWSER_FLAGS_ANDROID_CROMITE_NATIVE_UTILS_H_
+
+#include <jni.h>
+
+#include "base/feature_list.h"
+
+namespace chrome {
+namespace android {
+
+}  // namespace android
+}  // namespace chrome
+
+#endif  // CHROME_BROWSER_FLAGS_ANDROID_CROMITE_NATIVE_UTILS_H_
diff --git a/chrome/browser/flags/android/java/src/org/chromium/chrome/browser/flags/CromiteNativeUtils.java b/chrome/browser/flags/android/java/src/org/chromium/chrome/browser/flags/CromiteNativeUtils.java
new file mode 100755
--- /dev/null
+++ b/chrome/browser/flags/android/java/src/org/chromium/chrome/browser/flags/CromiteNativeUtils.java
@@ -0,0 +1,32 @@
+package org.chromium.chrome.browser.flags;
+
+import org.chromium.chrome.browser.flags.ChromeFeatureList;
+import org.chromium.chrome.browser.preferences.ChromePreferenceKeys;
+import org.chromium.chrome.browser.preferences.SharedPreferencesManager;
+
+import org.chromium.base.annotations.CalledByNative;
+import org.chromium.base.annotations.NativeMethods;
+
+public class CromiteNativeUtils {
+    /**
+     * Allows the modification of the flag value on the java side.
+     * Currently only the feature flag with on / off values is managed.
+     *
+     * @param featureName the feature name from ChromeFeatureList.
+     * @param flagName the flag name name from about_flags.cc.
+     */
+    public static void setFlagEnabled(String featureName, String flagName, Boolean newValue) {
+        CromiteNativeUtilsJni.get().setEnabled(flagName, newValue);
+
+        CachedFlag cachedFlag = ChromeFeatureList.sAllCachedFlags.get(featureName);
+        String preferenceName = cachedFlag.getSharedPreferenceKey();
+
+        SharedPreferencesManager.getInstance().writeBoolean(preferenceName, newValue);
+        cachedFlag.setValueReturnedOverride(newValue);
+    }
+
+    @NativeMethods
+    interface Natives {
+        void setEnabled(String featureName, boolean newValue);
+    }
+}
diff --git a/tools/grit/grit/grd_reader.py b/tools/grit/grit/grd_reader.py
--- a/tools/grit/grit/grd_reader.py
+++ b/tools/grit/grit/grd_reader.py
@@ -93,11 +93,28 @@ class GrdContentHandler(xml.sax.handler.ContentHandler):
         raise exception.FileNotFound(partname)
       # Exceptions propagate to the handler in grd_reader.Parse().
       oldsource = self.source
-      try:
-        self.source = partname
-        xml.sax.parse(partname, GrdPartContentHandler(self))
-      finally:
-        self.source = oldsource
+      # modifies the behavior of
+      #    <part file="folder" />
+      # allowing the inclusion of all grdp files found in the folder
+      # specified.
+      # the file value must end with "/placeholder.txt"
+      if partname.endswith("/placeholder.txt"):
+        partname = os.path.dirname(partname)
+        for root, dirs, files in os.walk(partname):
+          for file in files:
+            filepath = os.path.join(partname, file)
+            if filepath.endswith(".grdp"):
+              try:
+                self.source = partname
+                xml.sax.parse(filepath, GrdPartContentHandler(self))
+              finally:
+                self.source = oldsource
+      else:
+        try:
+          self.source = partname
+          xml.sax.parse(partname, GrdPartContentHandler(self))
+        finally:
+          self.source = oldsource
 
     if self.debug:
       print("End parsing of element %s" % name)
diff --git a/tools/grit/preprocess_if_expr.py b/tools/grit/preprocess_if_expr.py
--- a/tools/grit/preprocess_if_expr.py
+++ b/tools/grit/preprocess_if_expr.py
@@ -8,6 +8,7 @@ import io
 import json
 import os
 import sys
+import re
 
 # For Node, EvaluateExpression
 import grit.node.base
@@ -71,6 +72,35 @@ def ExtensionForComments(input_file):
     extension = '.html'
   return extension
 
+def _extract_template_from_dir(html_file):
+  template = ''
+  directory = os.path.dirname(html_file)
+  for root, dirs, directory_files in os.walk(directory):
+    for directory_file in directory_files:
+      if directory_file.endswith(".html"):
+        template += _extract_template(os.path.join(directory, directory_file))
+
+  return template
+
+def _extract_template(html_file):
+  include_re = re.compile(r'^\s*<include\s*path="(.*)"\s*/>')
+  with io.open(html_file, encoding='utf-8', mode='r') as f:
+    lines = f.readlines()
+
+    template_lines = []
+    for line in lines:
+      include_line = include_re.match(line)
+      if include_line:
+        include_file = include_line.groups()[0]
+        file_to_include = os.path.join(os.path.dirname(html_file), include_file)
+        if file_to_include.endswith("placeholder.txt"):
+          line = _extract_template_from_dir(file_to_include)
+        else:
+          line = _extract_template(file_to_include)
+      template_lines.append(line)
+
+    template = ''.join(template_lines)
+    return template
 
 def main(argv):
   parser = argparse.ArgumentParser()
@@ -95,7 +125,7 @@ def main(argv):
     in_path = os.path.join(in_folder, input_file)
     content = ""
     with open(in_path, encoding='utf-8') as f:
-      content = f.read()
+      content = _extract_template(in_path)
 
     removal_comments_extension = None  # None means no removal comments
     if args.enable_removal_comments:
--
2.25.1