Adding support for loading custom locale resources using a command line flag

ui/base/resource/resource_bundle_posix.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/base/resource/resource_bundle.h"
 
+#include "base/command_line.h"
+#include "base/file_path.h"
 #include "base/logging.h"
 #include "base/stl_util-inl.h"
 #include "base/string16.h"
 #include "base/string_piece.h"
 #include "base/synchronization/lock.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/data_pack.h"
 #include "ui/gfx/font.h"
 
 namespace ui {
@@ skipping 88 matching lines @@
         LoadResourcesDataPak(large_icon_resources_file_path);
     CHECK(large_icon_resources_data_) <<
         "failed to load theme_resources_large.pak";
   }
 }
 
 std::string ResourceBundle::LoadLocaleResources(
     const std::string& pref_locale) {
   DCHECK(!locale_resources_data_) << "locale.pak already loaded";
   std::string app_locale = l10n_util::GetApplicationLocale(pref_locale);
-  FilePath locale_file_path = GetLocaleFilePath(app_locale);
+  FilePath locale_file_path;
+  CommandLine *command_line = CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(kLocaleResourcePathSwitch)) {
+    locale_file_path =
+      command_line->GetSwitchValuePath(kLocaleResourcePathSwitch);
+  } else {
+    locale_file_path = GetLocaleFilePath(app_locale);
+  }
   if (locale_file_path.empty()) {
     // It's possible that there is no locale.pak.
     NOTREACHED();
     return std::string();
   }
   locale_resources_data_ = LoadResourcesDataPak(locale_file_path);
   CHECK(locale_resources_data_) << "failed to load locale.pak";
   return app_locale;
 }
 
 void ResourceBundle::LoadTestResources(const FilePath& path) {
   DCHECK(!resources_data_) << "resource already loaded";
 
   // Use the given resource pak for both common and localized resources.
   resources_data_ = LoadResourcesDataPak(path);
   locale_resources_data_ = LoadResourcesDataPak(path);
 }
 
 }  // namespace ui