cc: Route offscreen context creation for compositor to the browser.

cc/thread_proxy.h

Index: cc/thread_proxy.h
diff --git a/cc/thread_proxy.h b/cc/thread_proxy.h
index 9e383bbc7b0ab6caedc5a5d39272385023498528..283cb9557f0bacd182c4a371299a78a519849b9f 100644
--- a/cc/thread_proxy.h
+++ b/cc/thread_proxy.h
@@ -123,7 +123,7 @@ private:
         bool commitPending;
     };
     void forceBeginFrameOnImplThread(CompletionEvent*);
-    void beginFrameCompleteOnImplThread(CompletionEvent*, ResourceUpdateQueue*);
+    void beginFrameCompleteOnImplThread(CompletionEvent*, ResourceUpdateQueue*, WebKit::WebGraphicsContext3D* offscreenContext3d, GrContext* offscreenGrContext);
     void beginFrameAbortedOnImplThread();
     void requestReadbackOnImplThread(ReadbackRequest*);
     void requestStartPageScaleAnimationOnImplThread(gfx::Vector2d targetOffset, bool useAnchor, float scale, base::TimeDelta duration);
@@ -137,7 +137,7 @@ private:
     void manageTilesOnImplThread();
     void setFullRootLayerDamageOnImplThread();
     void acquireLayerTexturesForMainThreadOnImplThread(CompletionEvent*);
-    void recreateOutputSurfaceOnImplThread(CompletionEvent*, scoped_ptr<OutputSurface>, bool* recreateSucceeded, RendererCapabilities*);
+    void recreateOutputSurfaceOnImplThread(CompletionEvent*, scoped_ptr<OutputSurface>, WebKit::WebGraphicsContext3D* offscreenContext3d, GrContext* offscreenGrContext, bool* recreateSucceeded, RendererCapabilities*);
     void renderingStatsOnImplThread(CompletionEvent*, RenderingStats*);
     ScheduledActionDrawAndSwapResult scheduledActionDrawAndSwapInternal(bool forcedDraw);
     void forceSerializeOnSwapBuffersOnImplThread(CompletionEvent*);