Allow GLES2CmdDecoder to change the GLSurface associated with the default FBO.

gpu/command_buffer/service/gles2_cmd_decoder_mock.h

Index: gpu/command_buffer/service/gles2_cmd_decoder_mock.h
===================================================================
--- gpu/command_buffer/service/gles2_cmd_decoder_mock.h	(revision 137438)
+++ gpu/command_buffer/service/gles2_cmd_decoder_mock.h	(working copy)
@@ -40,7 +40,8 @@
                     const DisallowedFeatures& disallowed_features,
                     const char* allowed_extensions,
                     const std::vector<int32>& attribs));
-  MOCK_METHOD0(Destroy, void());
+  MOCK_METHOD1(Destroy, void(bool have_context));
+  MOCK_METHOD1(SetSurface, void(const scoped_refptr<gfx::GLSurface>& surface));
   MOCK_METHOD2(SetParent, bool(GLES2Decoder* parent, uint32 parent_texture_id));
   MOCK_METHOD1(ResizeOffscreenFrameBuffer, bool(const gfx::Size& size));
   MOCK_METHOD0(MakeCurrent, bool());