Add a new API in WebMediaPlayer to do a GPU-GPU textures copy if possible

webkit/media/webmediaplayer_impl.h

Index: webkit/media/webmediaplayer_impl.h
diff --git a/webkit/media/webmediaplayer_impl.h b/webkit/media/webmediaplayer_impl.h
index 2b4faa3f966e4f6f079c2bb88a2781b306d3a6ef..b3ba28a92ebeeb60f4fb855ec11049d2ba282cc0 100644
--- a/webkit/media/webmediaplayer_impl.h
+++ b/webkit/media/webmediaplayer_impl.h
@@ -32,6 +32,7 @@
 #include "media/base/pipeline.h"
 #include "media/filters/skcanvas_video_renderer.h"
 #include "skia/ext/platform_canvas.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebAudioSourceProvider.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebMediaPlayer.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebMediaPlayerClient.h"
@@ -140,6 +141,12 @@ class WebMediaPlayerImpl
   virtual WebKit::WebVideoFrame* getCurrentFrame();
   virtual void putCurrentFrame(WebKit::WebVideoFrame* web_video_frame);
 
+  // Query if GPU-accelerated video decode is in use to check if it is possible to use video texture at GPU side
+  // without readback to system memory.
+  virtual bool videoDecodeAcceleratedByGpu();
+  // Do the GPU-GPU texture copy using CHROMIUM_copy_texture extension
+  virtual bool copyVideoTextureToPlatformTexture(WebKit::WebGraphicsContext3D* webGraphicsContext, unsigned int texture, unsigned int internalFormat);
+
   virtual WebKit::WebAudioSourceProvider* audioSourceProvider();
 
   virtual AddIdStatus sourceAddId(