Add animation support for WebP images

Source/core/page/RuntimeEnabledFeatures.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 226 matching lines @@
 
     static bool directoryUploadEnabled() { return isDirectoryUploadEnabled; }
     static void setDirectoryUploadEnabled(bool isEnabled) { isDirectoryUploadEnabled = isEnabled; }
 
     static void setExperimentalWebSocketEnabled(bool isEnabled) { isExperimentalWebSocketEnabled = isEnabled; }
     static bool experimentalWebSocketEnabled() { return isExperimentalWebSocketEnabled; }
 
     static bool imeAPIEnabled() { return isIMEAPIEnabled; }
     static void setIMEAPIEnabled(bool isEnabled) { isIMEAPIEnabled = isEnabled; }
 
+    static void setAnimatedWebPEnabled(bool isEnabled) { isAnimatedWebPEnabled = isEnabled; }
+    static bool animatedWebPEnabled() { return isAnimatedWebPEnabled; }
+
 private:
     // Never instantiate.
     RuntimeEnabledFeatures() { }
 
     static bool isLocalStorageEnabled;
     static bool isSessionStorageEnabled;
     static bool isWebkitNotificationsEnabled;
     static bool isApplicationCacheEnabled;
     static bool isGeolocationEnabled;
     static bool isIndexedDBEnabled;
@@ skipping 62 matching lines @@
 
     static bool isFontLoadEventsEnabled;
 
     static bool isWebPInAcceptHeaderEnabled;
 
     static bool isDirectoryUploadEnabled;
 
     static bool isExperimentalWebSocketEnabled;
 
     static bool isIMEAPIEnabled;
+
+    static bool isAnimatedWebPEnabled;
 };
 
 } // namespace WebCore
 
 #endif // RuntimeEnabledFeatures_h