Adding blink side flag that allows disabling YUV decoding

Source/web/WebRuntimeFeatures.cpp

 /*
  * Copyright (C) 2013 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 57 matching lines @@
 bool WebRuntimeFeatures::isCompositedSelectionUpdateEnabled()
 {
     return RuntimeEnabledFeatures::compositedSelectionUpdateEnabled();
 }
 
 void WebRuntimeFeatures::enableDatabase(bool enable)
 {
     RuntimeEnabledFeatures::setDatabaseEnabled(enable);
 }
 
+void WebRuntimeFeatures::enableDecodeToYUV(bool enable)
+{
+    RuntimeEnabledFeatures::setDecodeToYUVEnabled(enable);
+}
+
 void WebRuntimeFeatures::enableDisplayList2dCanvas(bool enable)
 {
     RuntimeEnabledFeatures::setDisplayList2dCanvasEnabled(enable);
 }
 
 void WebRuntimeFeatures::enableEncryptedMedia(bool enable)
 {
     RuntimeEnabledFeatures::setEncryptedMediaEnabled(enable);
     // FIXME: Hack to allow MediaKeyError to be enabled for either version.
     RuntimeEnabledFeatures::setEncryptedMediaAnyVersionEnabled(
@@ skipping 194 matching lines @@
 {
     RuntimeEnabledFeatures::setShowModalDialogEnabled(enable);
 }
 
 void WebRuntimeFeatures::enableLaxMixedContentChecking(bool enable)
 {
     RuntimeEnabledFeatures::setLaxMixedContentCheckingEnabled(enable);
 }
 
 } // namespace blink