gpu: Thread-safe command buffer state lookup.

gpu/command_buffer/service/command_buffer_service.h

Index: gpu/command_buffer/service/command_buffer_service.h
diff --git a/gpu/command_buffer/service/command_buffer_service.h b/gpu/command_buffer/service/command_buffer_service.h
index 0d305bf2582e29740f3b72ccb2a2c7331bc65986..9e030db0456707554c7d5ea31ad5ca0d338082d9 100644
--- a/gpu/command_buffer/service/command_buffer_service.h
+++ b/gpu/command_buffer/service/command_buffer_service.h
@@ -24,6 +24,9 @@ class GPU_EXPORT CommandBufferServiceBase : public CommandBuffer {
   // Sets the current get offset. This can be called from any thread.
   virtual void SetGetOffset(int32_t get_offset) = 0;
 
+  // Set the release count for the last fence sync seen in the command stream.
+  virtual void SetReleaseCount(uint64_t release_count) = 0;
+
   // Get the transfer buffer associated with an ID. Returns a null buffer for
   // ID 0.
   virtual scoped_refptr<gpu::Buffer> GetTransferBuffer(int32_t id) = 0;
@@ -54,17 +57,17 @@ class GPU_EXPORT CommandBufferService : public CommandBufferServiceBase {
 
   // 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 transfer_buffer_id) override;
   scoped_refptr<Buffer> CreateTransferBuffer(size_t size, int32_t* id) override;
   void DestroyTransferBuffer(int32_t id) override;
 
   // CommandBufferServiceBase implementation:
   void SetGetOffset(int32_t get_offset) override;
+  void SetReleaseCount(uint64_t release_count) override;
   scoped_refptr<Buffer> GetTransferBuffer(int32_t id) override;
   void SetToken(int32_t token) override;
   void SetParseError(error::Error error) override;
@@ -110,6 +113,7 @@ class GPU_EXPORT CommandBufferService : public CommandBufferServiceBase {
   base::Closure parse_error_callback_;
   scoped_refptr<TransferBufferManagerInterface> transfer_buffer_manager_;
   int32_t token_;
+  uint64_t release_count_;
   uint32_t generation_;
   error::Error error_;
   error::ContextLostReason context_lost_reason_;