Harden CommandBufferProxyImpl

content/common/gpu/client/command_buffer_proxy_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_COMMON_GPU_CLIENT_COMMAND_BUFFER_PROXY_IMPL_H_
 #define CONTENT_COMMON_GPU_CLIENT_COMMAND_BUFFER_PROXY_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 189 matching lines @@
                               gfx::SwapResult result);
   void OnUpdateVSyncParameters(base::TimeTicks timebase,
                                base::TimeDelta interval);
 
   // Try to read an updated copy of the state from shared memory.
   void TryUpdateState();
 
   // 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;
 
   base::Lock* lock_;
 
   // Unowned list of DeletionObservers.
   base::ObserverList<DeletionObserver> deletion_observers_;
 
   // The last cached state received from the service.
   State last_state_;
@@ skipping 31 matching lines @@
   uint32_t next_signal_id_;
   SignalTaskMap signal_tasks_;
 
   gpu::Capabilities capabilities_;
 
   std::vector<ui::LatencyInfo> latency_info_;
 
   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);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_COMMAND_BUFFER_PROXY_IMPL_H_