compositor-worker: Introduce CompositorWorker.

public/web/WebRuntimeFeatures.h

 /*
  * 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 36 matching lines @@
     // RuntimeEnabledFeatures.in.
     BLINK_EXPORT static void enableFeatureFromString(const WebString& name, bool enable);
 
     BLINK_EXPORT static void enableApplicationCache(bool);
 
     BLINK_EXPORT static void enableDatabase(bool);
 
     BLINK_EXPORT static void enableCompositedSelectionUpdate(bool);
     BLINK_EXPORT static bool isCompositedSelectionUpdateEnabled();
 
+    BLINK_EXPORT static void enableCompositorWorker(bool);

[tkent, 2015/03/25 05:55:10]

Why do you need public functions?

[sadrul, 2015/03/25 06:13:07]

My understanding is this would allow us to turn the feature on using a
command-line flag from chrome. Is there a better way for doing this?

[tkent, 2015/03/25 06:15:05]

Usually these functions are unnecessary for a feature with status=experimental
because users can enable it by
chrome://flags/#enable-experimental-web-platform-features

[sadrul, 2015/03/25 06:26:37]

Ah, yes. That would be sufficient. Thanks. Removed these.

+    BLINK_EXPORT static bool isCompositorWorkerEnabled();
+
     BLINK_EXPORT static void enableDecodeToYUV(bool);
 
     BLINK_EXPORT static void enableDisplayList2dCanvas(bool);
     BLINK_EXPORT static void forceDisplayList2dCanvas(bool);
 
     BLINK_EXPORT static void enableEncryptedMedia(bool);
     BLINK_EXPORT static bool isEncryptedMediaEnabled();
 
     BLINK_EXPORT static void enablePrefixedEncryptedMedia(bool);
     BLINK_EXPORT static bool isPrefixedEncryptedMediaEnabled();
@@ skipping 90 matching lines @@
     BLINK_EXPORT static void enableUnsafeES3APIs(bool);
 
     BLINK_EXPORT static void enableVRDevice(bool);
 private:
     WebRuntimeFeatures();
 };
 
 } // namespace blink
 
 #endif