Associate an id with the output surface to handle lost contexts

content/browser/renderer_host/render_widget_host_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 
 #include <deque>
 #include <list>
 #include <map>
@@ skipping 430 matching lines @@
 
   // Called by the view in response to AcceleratedSurfaceBuffersSwapped or
   // AcceleratedSurfacePostSubBuffer.
   static void AcknowledgeBufferPresent(
       int32 route_id,
       int gpu_host_id,
       const AcceleratedSurfaceMsg_BufferPresented_Params& params);
 
   // Called by the view in response to OnSwapCompositorFrame.
   static void SendSwapCompositorFrameAck(
-      int32 route_id, int renderer_host_id, const cc::CompositorFrameAck& ack);
+      int32 route_id,
+      uint32 output_surface_id,
+      int renderer_host_id,
+      const cc::CompositorFrameAck& ack);
 
   // Called by the view in response to AcceleratedSurfaceBuffersSwapped for
   // platforms that support deferred GPU process descheduling. This does
   // nothing if the compositor thread is enabled.
   // TODO(jbates) Once the compositor thread is always on, this can be removed.
   void AcknowledgeSwapBuffersToRenderer();
 
   bool is_threaded_compositing_enabled() const {
     return is_threaded_compositing_enabled_;
   }
@@ skipping 496 matching lines @@
   int64 last_input_number_;
 
   BrowserRenderingStats rendering_stats_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_