[Reland 1] Pepper takes ownership of a mailbox before passing it to the texture layer.

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 60db893516b146e7092fb3842a37c139d3e6c8bc..1c801179dc1b1b1eb0461afe07436b29b871942f 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_mock.h
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_mock.h
@@ -52,7 +52,10 @@ class MockGLES2Decoder : public GLES2Decoder {
                     const std::vector<int32_t>& attribs));
   MOCK_METHOD1(Destroy, void(bool have_context));
   MOCK_METHOD1(SetSurface, void(const scoped_refptr<gfx::GLSurface>& surface));
-  MOCK_METHOD1(ProduceFrontBuffer, void(const Mailbox& mailbox));
+  MOCK_METHOD1(TakeFrontBuffer, void(const Mailbox& mailbox));
+  MOCK_METHOD2(ReturnFrontBuffer, void(const Mailbox& mailbox, bool is_lost));
+  MOCK_METHOD0(GetSavedBackTextureCountForTest, size_t());
+  MOCK_METHOD0(GetCreatedBackTextureCountForTest, size_t());
   MOCK_METHOD1(ResizeOffscreenFrameBuffer, bool(const gfx::Size& size));
   MOCK_METHOD0(MakeCurrent, bool());
   MOCK_METHOD1(GetServiceIdForTesting, uint32_t(uint32_t client_id));