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 bf7d445eca781c3766daaa8dcf90210c2f296625..160265eedfba8b4ce4ea843f0e58011e587d8456 100644
--- a/cc/thread_proxy.h
+++ b/cc/thread_proxy.h
@@ -122,7 +122,7 @@ private:
         bool commitPending;
     };
     void forceBeginFrameOnImplThread(CompletionEvent*);
-    void beginFrameCompleteOnImplThread(CompletionEvent*, ResourceUpdateQueue*);
+    void beginFrameCompleteOnImplThread(CompletionEvent*, ResourceUpdateQueue*, WebKit::WebGraphicsContext3D* offscreenContext3d);
     void beginFrameAbortedOnImplThread();
     void requestReadbackOnImplThread(ReadbackRequest*);
     void requestStartPageScaleAnimationOnImplThread(gfx::Vector2d targetOffset, bool useAnchor, float scale, base::TimeDelta duration);
@@ -136,7 +136,7 @@ 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, bool* recreateSucceeded, RendererCapabilities*);
     void renderingStatsOnImplThread(CompletionEvent*, RenderingStats*);
     ScheduledActionDrawAndSwapResult scheduledActionDrawAndSwapInternal(bool forcedDraw);
     void forceSerializeOnSwapBuffersOnImplThread(CompletionEvent*);