Accelerate small canvases if Ganesh is on.

Source/core/loader/EmptyClients.h

Index: Source/core/loader/EmptyClients.h
diff --git a/Source/core/loader/EmptyClients.h b/Source/core/loader/EmptyClients.h
index 48cdabf1291e6a2091c836cecc668050a7dc34c0..f075e64ffa2959f270dd90a356e475fdb2ff5969 100644
--- a/Source/core/loader/EmptyClients.h
+++ b/Source/core/loader/EmptyClients.h
@@ -161,6 +161,9 @@ public:
     virtual void annotatedRegionsChanged() OVERRIDE { }
     virtual bool paintCustomOverhangArea(GraphicsContext*, const IntRect&, const IntRect&, const IntRect&) OVERRIDE { return false; }
     virtual String acceptLanguages() OVERRIDE;
+
+    virtual bool usesGpuRasterization() OVERRIDE { return false; }
+
 };
 
 class EmptyFrameLoaderClient FINAL : public FrameLoaderClient {