Revert "Revert 210138 "Perform glReadPixels with PBOs in the gpu, if PBO...""

gpu/command_buffer/service/gles2_cmd_decoder_mock.h

Index: gpu/command_buffer/service/gles2_cmd_decoder_mock.h
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_mock.h b/gpu/command_buffer/service/gles2_cmd_decoder_mock.h
index 5fe0600bfa6faad2f90b43564223079b204c5f39..e6c497faca6d89e4c4d16ba9188a73714e81dcc4 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_mock.h
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_mock.h
@@ -102,6 +102,8 @@ class MockGLES2Decoder : public GLES2Decoder {
                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());