media: Optimize HW Video to 2D Canvas copy.

media/blink/webmediaplayer_impl.h

Index: media/blink/webmediaplayer_impl.h
diff --git a/media/blink/webmediaplayer_impl.h b/media/blink/webmediaplayer_impl.h
index e87599505b94fda0776d43624d3248e6d31d8762..a545f42c16fca1b6713698be08a5d95df28eacf6 100644
--- a/media/blink/webmediaplayer_impl.h
+++ b/media/blink/webmediaplayer_impl.h
@@ -23,15 +23,16 @@
 #include "media/blink/buffered_data_source.h"
 #include "media/blink/buffered_data_source_host_impl.h"
 #include "media/blink/video_frame_compositor.h"
+#include "media/blink/webmediaplayer_params.h"
 #include "media/filters/skcanvas_video_renderer.h"
 #include "third_party/WebKit/public/platform/WebAudioSourceProvider.h"
 #include "third_party/WebKit/public/platform/WebContentDecryptionModuleResult.h"
-#include "third_party/WebKit/public/platform/WebGraphicsContext3D.h"
 #include "third_party/WebKit/public/platform/WebMediaPlayer.h"
 #include "third_party/WebKit/public/platform/WebMediaPlayerClient.h"
 #include "url/gurl.h"
 
 namespace blink {
+class WebGraphicsContext3D;
 class WebLocalFrame;
 }
 
@@ -52,7 +53,6 @@ class MediaLog;
 class VideoFrameCompositor;
 class WebAudioSourceProviderImpl;
 class WebMediaPlayerDelegate;
-class WebMediaPlayerParams;
 class WebTextTrackImpl;
 
 // The canonical implementation of blink::WebMediaPlayer that's backed by
@@ -271,7 +271,9 @@ class MEDIA_EXPORT WebMediaPlayerImpl
 
   base::WeakPtr<WebMediaPlayerDelegate> delegate_;
 
-  base::Callback<void(const base::Closure&)> defer_load_cb_;
+  WebMediaPlayerParams::DeferLoadCB defer_load_cb_;
+  WebMediaPlayerParams::ContextProviderCB
+      shared_main_thread_context_provider_cb_;
 
   // Factories for supporting video accelerators. May be null.
   scoped_refptr<GpuVideoAcceleratorFactories> gpu_factories_;