Add a policy to re-enable deprecated web platform features.

chrome/browser/renderer_preferences_util.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/renderer_preferences_util.h"
 
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/pref_names.h"
 #include "content/public/common/renderer_preferences.h"
@@ skipping 66 matching lines @@
 
 void UpdateFromSystemSettings(
     content::RendererPreferences* prefs, Profile* profile) {
   const PrefService* pref_service = profile->GetPrefs();
   prefs->accept_languages = pref_service->GetString(prefs::kAcceptLanguages);
   prefs->enable_referrers = pref_service->GetBoolean(prefs::kEnableReferrers);
   prefs->enable_do_not_track =
       pref_service->GetBoolean(prefs::kEnableDoNotTrack);
   prefs->default_zoom_level = pref_service->GetDouble(prefs::kDefaultZoomLevel);
 
+  prefs->deprecated_features_to_enable.clear();
+  prefs->deprecated_features_to_enable.resize(
+      content::RENDERER_PREFERENCES_DEPRECATED_FEATURE_COUNT, false);
+  const base::ListValue* deprecated_features_list =
+      pref_service->GetList(prefs::kEnableDeprecatedWebPlatformFeatures);
+  for (base::ListValue::const_iterator feature(
+           deprecated_features_list->begin());
+       feature != deprecated_features_list->end();
+       ++feature) {
+    int value = -1;
+    if ((*feature)->GetAsInteger(&value) && value >= 0 &&
+        value < content::RENDERER_PREFERENCES_DEPRECATED_FEATURE_COUNT) {

[Andrew T Wilson (Slow), 2014/05/08 11:32:45]

Hmmm. Should the bounds check be a DCHECK instead?

[Mattias Nissler (ping if slow), 2014/05/09 16:38:27]

Well, pref values are not guaranteed to be totally under Chrome's control in
general, so I prefer this version to make absolutely sure we don't write out of
bounds.

+      prefs->deprecated_features_to_enable[value] = true;
+    }
+  }
+
 #if defined(TOOLKIT_GTK)
   GtkThemeService* theme_service = GtkThemeService::GetFrom(profile);
   prefs->focus_ring_color = theme_service->get_focus_ring_color();
   prefs->thumb_active_color = theme_service->get_thumb_active_color();
   prefs->thumb_inactive_color = theme_service->get_thumb_inactive_color();
   prefs->track_color = theme_service->get_track_color();
   prefs->active_selection_bg_color =
       theme_service->get_active_selection_bg_color();
   prefs->active_selection_fg_color =
       theme_service->get_active_selection_fg_color();
@@ skipping 73 matching lines @@
       GetRendererPreferencesSubpixelRenderingEnum(params.subpixel_rendering);
 #endif
 
 #if !defined(OS_MACOSX)
   prefs->plugin_fullscreen_allowed =
       pref_service->GetBoolean(prefs::kFullscreenAllowed);
 #endif
 }
 
 }  // namespace renderer_preferences_util