Fixing Canvas2DLayerBridge to handle lost graphics contexts

Source/WebKit/chromium/tests/Canvas2DLayerManagerTest.cpp

Index: Source/WebKit/chromium/tests/Canvas2DLayerManagerTest.cpp
diff --git a/Source/WebKit/chromium/tests/Canvas2DLayerManagerTest.cpp b/Source/WebKit/chromium/tests/Canvas2DLayerManagerTest.cpp
index a5b2c71ef12e94369dbac82b7d87a985470f2c3e..9bf0905d59c2ed4d193abc6d23d0ca83a3b3f316 100644
--- a/Source/WebKit/chromium/tests/Canvas2DLayerManagerTest.cpp
+++ b/Source/WebKit/chromium/tests/Canvas2DLayerManagerTest.cpp
@@ -48,6 +48,7 @@ public:
         , m_freeMemoryIfPossibleCount(0)
         , m_flushCount(0)
     {
+        m_fakeSharedContext = m_context;
     }
 
     virtual size_t storageAllocatedForRecording() OVERRIDE
@@ -81,10 +82,17 @@ public:
         m_flushCount++;
     }
 
+protected:
+    virtual PassRefPtr<GraphicsContext3D> getSharedContext() const OVERRIDE
+    {
+        return m_fakeSharedContext;
+    }
 public:
     size_t m_freeableBytes;
     int m_freeMemoryIfPossibleCount;
     int m_flushCount;
+private:
+    RefPtr<GraphicsContext3D> m_fakeSharedContext;
 };
 
 static PassOwnPtr<SkDeferredCanvas> createCanvas(GraphicsContext3D* context) {