Establish mojo service between Canvas (blink) and SurfaceManager (browser)

third_party/WebKit/Source/modules/canvas/HTMLCanvasElementModuleTest.cpp

Index: third_party/WebKit/Source/modules/canvas/HTMLCanvasElementModuleTest.cpp
diff --git a/third_party/WebKit/Source/modules/canvas/HTMLCanvasElementModuleTest.cpp b/third_party/WebKit/Source/modules/canvas/HTMLCanvasElementModuleTest.cpp
index 7ddd64cf5edb467a857fe0e34e754c74b403d170..d06f1c3f8661a668ed87efde11e3478a773ad2c2 100644
--- a/third_party/WebKit/Source/modules/canvas/HTMLCanvasElementModuleTest.cpp
+++ b/third_party/WebKit/Source/modules/canvas/HTMLCanvasElementModuleTest.cpp
@@ -29,14 +29,23 @@ protected:
     }
 
     HTMLCanvasElement& canvasElement() const { return *m_canvasElement; }
+    OffscreenCanvas* transferControlToOffscreen(ExceptionState&);
+
 private:
     Persistent<HTMLCanvasElement> m_canvasElement;
 };
 
+OffscreenCanvas* HTMLCanvasElementModuleTest::transferControlToOffscreen(ExceptionState& exceptionState)
+{
+    // This unit test only tests if the Canvas Id is associated correctly, so we exclude the part that
+    // creates surface layer bridge because a mojo message pipe cannot be tested using webkit unit tests.
+    return HTMLCanvasElementModule::transferControlToOffscreenInternal(canvasElement(), exceptionState);
+}
+
 TEST_F(HTMLCanvasElementModuleTest, TransferControlToOffscreen)
 {
     NonThrowableExceptionState exceptionState;
-    OffscreenCanvas* offscreenCanvas = HTMLCanvasElementModule::transferControlToOffscreen(canvasElement(), exceptionState);
+    OffscreenCanvas* offscreenCanvas = transferControlToOffscreen(exceptionState);
     int canvasId = offscreenCanvas->getAssociatedCanvasId();
     EXPECT_EQ(canvasId, DOMNodeIds::idForNode(&(canvasElement())));
 }