Free temporary GPU and memory resources held by inactive or hidden 2D canvases

Source/web/tests/Canvas2DLayerBridgeTest.cpp

Index: Source/web/tests/Canvas2DLayerBridgeTest.cpp
diff --git a/Source/web/tests/Canvas2DLayerBridgeTest.cpp b/Source/web/tests/Canvas2DLayerBridgeTest.cpp
index 83db780914d5d964fb146e5191208dfff3975bcc..73e87de9935840b959c9fce0b207165b0876761e 100644
--- a/Source/web/tests/Canvas2DLayerBridgeTest.cpp
+++ b/Source/web/tests/Canvas2DLayerBridgeTest.cpp
@@ -70,6 +70,12 @@ private:
     RefPtr<Canvas2DLayerBridge> m_layerBridge;
 };
 
+class FakeCanvas2DLayerBridgeClient : public Canvas2DLayerBridgeClient {
+public:
+    virtual ~FakeCanvas2DLayerBridgeClient() { }
+    virtual bool hidden() const OVERRIDE { return false; }
+};
+
 } // namespace
 
 class Canvas2DLayerBridgeTest : public Test {
@@ -85,7 +91,8 @@ protected:
         ::testing::Mock::VerifyAndClearExpectations(&mainMock);
 
         {
-            Canvas2DLayerBridgePtr bridge(adoptRef(new Canvas2DLayerBridge(mainContext.release(), canvas.release(), 0, NonOpaque)));
+            FakeCanvas2DLayerBridgeClient client;
+            Canvas2DLayerBridgePtr bridge(adoptRef(new Canvas2DLayerBridge(&client, mainContext.release(), canvas.release(), 0, NonOpaque)));
 
             ::testing::Mock::VerifyAndClearExpectations(&mainMock);