Perform glReadPixels with PBOs in the gpu, if PBOs are available.

gpu/command_buffer/service/gles2_cmd_decoder_mock.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.
 
 // This file contains the mock GLES2Decoder class.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_MOCK_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_MOCK_H_
 
 #include <vector>
@@ skipping 85 matching lines @@
       int width,
       int height,
       bool is_texture_immutable));
   MOCK_METHOD0(GetErrorState, ErrorState *());
 
   MOCK_METHOD0(GetLogger, Logger*());
   MOCK_METHOD1(SetShaderCacheCallback,
                void(const ShaderCacheCallback& callback));
   MOCK_METHOD1(SetWaitSyncPointCallback,
                void(const WaitSyncPointCallback& callback));
+  MOCK_METHOD1(WaitForReadPixels,
+               void(base::Closure callback));
   MOCK_METHOD0(GetTextureUploadCount, uint32());
   MOCK_METHOD0(GetTotalTextureUploadTime, base::TimeDelta());
   MOCK_METHOD0(GetTotalProcessingCommandsTime, base::TimeDelta());
   MOCK_METHOD1(AddProcessingCommandsTime, void(base::TimeDelta));
   MOCK_METHOD0(WasContextLost, bool());
   MOCK_METHOD1(LoseContext, void(uint32 reset_status));
 
   DISALLOW_COPY_AND_ASSIGN(MockGLES2Decoder);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_MOCK_H_