Add new extension APIs related to animation policy.

chrome/browser/ui/prefs/prefs_tab_helper.cc

Index: chrome/browser/ui/prefs/prefs_tab_helper.cc
diff --git a/chrome/browser/ui/prefs/prefs_tab_helper.cc b/chrome/browser/ui/prefs/prefs_tab_helper.cc
index 3f7ba0db6ee1279564af61547f9f668cc9c3a063..ea1f292eab19d0e1d4ea426a3ce298fbfc367ed5 100644
--- a/chrome/browser/ui/prefs/prefs_tab_helper.cc
+++ b/chrome/browser/ui/prefs/prefs_tab_helper.cc
@@ -49,6 +49,10 @@
 #include "base/win/windows_version.h"
 #endif
 
+#if defined(ENABLE_EXTENSIONS)
+#include "chrome/browser/chrome_content_browser_client.h"
+#endif
+
 using content::WebContents;
 using content::WebPreferences;
 
@@ -58,6 +62,9 @@ namespace {
 
 // The list of prefs we want to observe.
 const char* kPrefsToObserve[] = {
+#if defined(ENABLE_EXTENSIONS)
+  prefs::kAnimationPolicy,
+#endif
   prefs::kDefaultCharset,
   prefs::kDisable3DAPIs,
   prefs::kEnableHyperlinkAuditing,
@@ -515,6 +522,12 @@ void PrefsTabHelper::InitIncognitoUserPrefStore(
 void PrefsTabHelper::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry) {
   WebPreferences pref_defaults;
+#if defined(ENABLE_EXTENSIONS)
+  registry->RegisterStringPref(
+      prefs::kAnimationPolicy,
+      chrome::kAnimationPolicyAllowed,
+      user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);

[Lei Zhang, 2015/01/30 20:18:08]

Should this be a syncable pref? I don't know the answer for sure, but the
majority of the prefs below are unsyncable, so I think we should discuss this.

[je_julie(Not used), 2015/01/31 07:25:35]

There is no specific reason using SYNCABLE_PREF. 
I refered to kAcceptLanguages case.
I think there is no problem with UNSYNCABLE_PREF for animation policy.

+#endif
   registry->RegisterBooleanPref(
       prefs::kWebKitJavascriptEnabled,
       pref_defaults.javascript_enabled,