gpu: Thread-safe command buffer state lookup.

gpu/ipc/in_process_command_buffer.h

Index: gpu/ipc/in_process_command_buffer.h
diff --git a/gpu/ipc/in_process_command_buffer.h b/gpu/ipc/in_process_command_buffer.h
index ae2aed2a59e24da62334ff3cdb7ed0b246b71394..490963e03fddaed0b0840a8f3bfbcfee1030a368 100644
--- a/gpu/ipc/in_process_command_buffer.h
+++ b/gpu/ipc/in_process_command_buffer.h
@@ -98,16 +98,14 @@ class GPU_EXPORT InProcessCommandBuffer : public CommandBuffer,
 
   // CommandBuffer implementation:
   State GetLastState() override;
-  int32_t GetLastToken() override;
   void Flush(int32_t put_offset) override;
   void OrderingBarrier(int32_t put_offset) override;
-  void WaitForTokenInRange(int32_t start, int32_t end) override;
-  void WaitForGetOffsetInRange(int32_t start, int32_t end) override;
+  State WaitForTokenInRange(int32_t start, int32_t end) override;
+  State WaitForGetOffsetInRange(int32_t start, int32_t end) override;
   void SetGetBuffer(int32_t shm_id) override;
   scoped_refptr<gpu::Buffer> CreateTransferBuffer(size_t size,
                                                   int32_t* id) override;
   void DestroyTransferBuffer(int32_t id) override;
-  gpu::error::Error GetLastError() override;
 
   // GpuControl implementation:
   // NOTE: The GpuControlClient will be called on the client thread.
@@ -132,6 +130,7 @@ class GPU_EXPORT InProcessCommandBuffer : public CommandBuffer,
   bool IsFenceSyncRelease(uint64_t release) override;
   bool IsFenceSyncFlushed(uint64_t release) override;
   bool IsFenceSyncFlushReceived(uint64_t release) override;
+  bool IsFenceSyncReleased(uint64_t release) override;
   void SignalSyncToken(const SyncToken& sync_token,
                        const base::Closure& callback) override;
   bool CanWaitUnverifiedSyncToken(const SyncToken* sync_token) override;