Update from https://crrev.com/303153

gpu/command_buffer/client/client_test_helper.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.
 
 // Helper classes for implementing gpu client side unit tests.
 
 #ifndef GPU_COMMAND_BUFFER_CLIENT_CLIENT_TEST_HELPER_H_
 #define GPU_COMMAND_BUFFER_CLIENT_CLIENT_TEST_HELPER_H_
 
 #include "base/compiler_specific.h"
@@ skipping 23 matching lines @@
   void WaitForTokenInRange(int32 start, int32 end) override;
   void WaitForGetOffsetInRange(int32 start, int32 end) override;
   void SetGetBuffer(int transfer_buffer_id) override;
   void SetGetOffset(int32 get_offset) override;
   scoped_refptr<gpu::Buffer> CreateTransferBuffer(size_t size,
                                                   int32* id) override;
   scoped_refptr<gpu::Buffer> GetTransferBuffer(int32 id) override;
   void SetToken(int32 token) override;
   void SetParseError(error::Error error) override;
   void SetContextLostReason(error::ContextLostReason reason) override;
+  int32 GetPutOffset() override;
 
   // Get's the Id of the next transfer buffer that will be returned
   // by CreateTransferBuffer. This is useful for testing expected ids.
   int32 GetNextFreeTransferBufferId();
 
   void FlushHelper(int32 put_offset);
   void DestroyTransferBufferHelper(int32 id);
 
   virtual void OnFlush() = 0;
 
  private:
   scoped_refptr<Buffer> transfer_buffer_buffers_[kMaxTransferBuffers];
   CommandBufferEntry* ring_buffer_;
   scoped_refptr<Buffer> ring_buffer_buffer_;
   State state_;
+  int32 put_offset_;
 };
 
 class MockClientCommandBuffer : public MockCommandBufferBase {
  public:
   MockClientCommandBuffer();
   virtual ~MockClientCommandBuffer();
 
   // This is so we can use all the gmock functions when Flush is called.
   MOCK_METHOD0(OnFlush, void());
   MOCK_METHOD1(DestroyTransferBuffer, void(int32 id));
@@ skipping 39 matching lines @@
   MOCK_METHOD1(CreateStreamTexture, uint32(uint32));
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockClientGpuControl);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_CLIENT_TEST_HELPER_H_