Pass initial size and GPU preference via context attributes

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 008ba7f2cc8da84810872bc7cddbebd36f6f9fa2..eafd72918bb79901768638d58f9d7c302446c86d 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_mock.h
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_mock.h
@@ -44,11 +44,10 @@ class MockGLES2Decoder : public GLES2Decoder {
                               int num_entries,
                               int* entries_processed);
 
-  MOCK_METHOD6(Initialize,
+  MOCK_METHOD5(Initialize,
                bool(const scoped_refptr<gl::GLSurface>& surface,
                     const scoped_refptr<gl::GLContext>& context,
                     bool offscreen,
-                    const gfx::Size& size,
                     const DisallowedFeatures& disallowed_features,
                     const ContextCreationAttribHelper& attrib_helper));
   MOCK_METHOD1(Destroy, void(bool have_context));