sync compositor: Handle context loss

content/renderer/android/synchronous_compositor_proxy.h

Index: content/renderer/android/synchronous_compositor_proxy.h
diff --git a/content/renderer/android/synchronous_compositor_proxy.h b/content/renderer/android/synchronous_compositor_proxy.h
index a07e7d814a2066d2dd2d2a94b5e4b2eca94544ac..3bb4692204ccb1afb889f7683e7b0cc14437b9f7 100644
--- a/content/renderer/android/synchronous_compositor_proxy.h
+++ b/content/renderer/android/synchronous_compositor_proxy.h
@@ -52,7 +52,6 @@ class SynchronousCompositorProxy
   SynchronousCompositorProxy(
       int routing_id,
       IPC::Sender* sender,
-      SynchronousCompositorOutputSurface* output_surface,
       SynchronousCompositorExternalBeginFrameSource* begin_frame_source,
       ui::SynchronousInputHandlerProxy* input_handler_proxy,
       InputHandlerManagerClient::Handler* handler);
@@ -75,6 +74,7 @@ class SynchronousCompositorProxy
   void SwapBuffers(uint32_t output_surface_id,
                    cc::CompositorFrame* frame) override;
 
+  void SetOutputSurface(SynchronousCompositorOutputSurface* output_surface);
   void OnMessageReceived(const IPC::Message& message);
   bool Send(IPC::Message* message);
   void DidOverscroll(const DidOverscrollParams& did_overscroll_params);
@@ -125,11 +125,11 @@ class SynchronousCompositorProxy
 
   const int routing_id_;
   IPC::Sender* const sender_;
-  SynchronousCompositorOutputSurface* const output_surface_;
   SynchronousCompositorExternalBeginFrameSource* const begin_frame_source_;
   ui::SynchronousInputHandlerProxy* const input_handler_proxy_;
   InputHandlerManagerClient::Handler* const input_handler_;
   const bool use_in_process_zero_copy_software_draw_;
+  SynchronousCompositorOutputSurface* output_surface_;
   bool inside_receive_;
   IPC::Message* hardware_draw_reply_;
   IPC::Message* software_draw_reply_;