Harden CommandBufferProxyImpl

content/common/gpu/client/command_buffer_proxy_impl.h

Index: content/common/gpu/client/command_buffer_proxy_impl.h
diff --git a/content/common/gpu/client/command_buffer_proxy_impl.h b/content/common/gpu/client/command_buffer_proxy_impl.h
index a85b38fc87af93d325033929485f28474b0610a7..17589a7538e39129d46092dacb6a6b3d4daf54d6 100644
--- a/content/common/gpu/client/command_buffer_proxy_impl.h
+++ b/content/common/gpu/client/command_buffer_proxy_impl.h
@@ -207,6 +207,16 @@ class CommandBufferProxyImpl
   // Updates the highest verified release fence sync.
   void UpdateVerifiedReleases(uint32_t verified_flush);
 
+  // Loses the context after we received an invalid message from the GPU
+  // process. Will call the lost context callback reentrantly if any.
+  void InvalidGpuMessage();
+
+  // Loses the context after we received an invalid reply from the GPU
+  // process. Will post a task to call the lost context callback if any.
+  void InvalidGpuReply();
+
+  void InvalidGpuReplyOnClientThread();
+
   // The shared memory area used to update state.
   gpu::CommandBufferSharedState* shared_state() const;
 
@@ -258,6 +268,9 @@ class CommandBufferProxyImpl
   SwapBuffersCompletionCallback swap_buffers_completion_callback_;
   UpdateVSyncParametersCallback update_vsync_parameters_completion_callback_;
 
+  base::WeakPtr<CommandBufferProxyImpl> weak_this_;
+  scoped_refptr<base::SequencedTaskRunner> callback_thread_;
+
   DISALLOW_COPY_AND_ASSIGN(CommandBufferProxyImpl);
 };