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 9223933bd9f36f7ccac21188b2ef913fd6e560f5..5971260248519986f9e1ae050583fcd6992f6aab 100644
--- a/cc/thread_proxy.h
+++ b/cc/thread_proxy.h
@@ -15,6 +15,10 @@
 #include "cc/resource_update_controller.h"
 #include "cc/scheduler.h"
 
+namespace WebKit {
+class WebGraphicsContext3D;
+}
+
 namespace cc {
 
 class InputHandler;
@@ -122,7 +126,7 @@ 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);
@@ -136,7 +140,7 @@ 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*);
@@ -158,6 +162,7 @@ private:
     bool m_texturesAcquired;
     bool m_inCompositeAndReadback;
     bool m_manageTilesPending;
+
     // Weak pointer to use when posting tasks to the impl thread.
     base::WeakPtr<ThreadProxy> m_implThreadWeakPtr;