cc: Don't let invalidations that we're going to handle immediately cause an extra commit.

cc/layer.h

Index: cc/layer.h
diff --git a/cc/layer.h b/cc/layer.h
index 87839b484fe795efadd08757425520bd220856f1..e9902296e0222a03645184ccae0fd52feea478c4 100644
--- a/cc/layer.h
+++ b/cc/layer.h
@@ -321,6 +321,10 @@ protected:
     virtual scoped_ptr<LayerImpl> createLayerImpl(LayerTreeImpl* treeImpl);
     int m_layerId;
 
+    // When true, the layer is about to perform an update. Any commit requests
+    // will be handled implcitly after the update completes.
+    bool m_ignoreSetNeedsCommit;
+
 private:
     friend class base::RefCounted<Layer>;