Added --force-ui-direction flag for developers to force LTR or RTL.

chrome/browser/about_flags.cc

 // Copyright (c) 2012 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 "chrome/browser/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/feature_list.h"
+#include "base/i18n/base_i18n_switches.h"
 #include "base/memory/singleton.h"
 #include "base/metrics/metrics_hashes.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "cc/base/switches.h"
 #include "chrome/common/channel_info.h"
@@ skipping 480 matching lines @@
      "application/x-google-chrome-pdf,application/pdf"},
     {IDS_FLAGS_PPAPI_WIN32K_LOCKDOWN_FLASH_AND_PDF,
      switches::kEnableWin32kLockDownMimeTypes,
      "application/x-shockwave-flash,application/futuresplash,"
      "application/x-google-chrome-pdf,application/pdf"},
     {IDS_FLAGS_PPAPI_WIN32K_LOCKDOWN_ALL,
      switches::kEnableWin32kLockDownMimeTypes, "*"},
 };
 #endif  // defined(OS_WIN)
 
+const FeatureEntry::Choice kForceUIDirectionChoices[] = {
+    {IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", ""},
+    {IDS_FLAGS_FORCE_UI_DIRECTION_LTR, switches::kForceUIDirection,
+     switches::kForceUIDirectionLTR},
+    {IDS_FLAGS_FORCE_UI_DIRECTION_RTL, switches::kForceUIDirection,
+     switches::kForceUIDirectionRTL},
+};
+
 // RECORDING USER METRICS FOR FLAGS:
 // -----------------------------------------------------------------------------
 // The first line of the entry is the internal name. If you'd like to gather
 // statistics about the usage of your flag, you should append a marker comment
 // to the end of the feature name, like so:
 //   "my-special-feature",  // FLAGS:RECORD_UMA
 //
 // After doing that, run
 //   tools/metrics/actions/extract_actions.py
 // to add the metric to actions.xml (which will enable UMA to record your
@@ skipping 1556 matching lines @@
       IDS_FLAGS_ENABLE_MATERIAL_DESIGN_HISTORY_DESCRIPTION,
       kOsDesktop | kOsAndroid,
       SINGLE_VALUE_TYPE(switches::kEnableMaterialDesignHistory)},
 #if defined(OS_WIN)
     {"enable-windows-desktop-search-redirection",
      IDS_FLAGS_WINDOWS_DESKTOP_SEARCH_REDIRECTION_NAME,
      IDS_FLAGS_WINDOWS_DESKTOP_SEARCH_REDIRECTION_DESCRIPTION,
      kOsWin,
      FEATURE_VALUE_TYPE(kWindowsDesktopSearchRedirectionFeature)},
 #endif  // defined(OS_WIN)
+    {"force-ui-direction",
+     IDS_FLAGS_FORCE_UI_DIRECTION_NAME,
+     IDS_FLAGS_FORCE_UI_DIRECTION_DESCRIPTION,
+     kOsAll,
+     MULTI_VALUE_TYPE(kForceUIDirectionChoices)},
     // NOTE: Adding new command-line switches requires adding corresponding
     // entries to enum "LoginCustomFlags" in histograms.xml. See note in
     // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.
 };
 
 class FlagsStateSingleton {
  public:
   FlagsStateSingleton()
       : flags_state_(kFeatureEntries, arraysize(kFeatureEntries)) {}
   ~FlagsStateSingleton() {}
@@ skipping 193 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags