Align physical pixels of scrolled layers

cc/layer_tree_host_impl.cc

Index: cc/layer_tree_host_impl.cc
diff --git a/cc/layer_tree_host_impl.cc b/cc/layer_tree_host_impl.cc
index f9c464d1712c59ee8b4e8583a108952f6403747b..aa32c38e48e0a5c636f59d0d606f3ae3a50c4160 100644
--- a/cc/layer_tree_host_impl.cc
+++ b/cc/layer_tree_host_impl.cc
@@ -919,23 +919,6 @@ LayerImpl* LayerTreeHostImpl::currentlyScrollingLayer() const
   return m_activeTree->CurrentlyScrollingLayer();
 }
 
-// Content layers can be either directly scrollable or contained in an outer
-// scrolling layer which applies the scroll transform. Given a content layer,
-// this function returns the associated scroll layer if any.
-static LayerImpl* findScrollLayerForContentLayer(LayerImpl* layerImpl)
-{
-    if (!layerImpl)
-        return 0;
-
-    if (layerImpl->scrollable())
-        return layerImpl;
-
-    if (layerImpl->drawsContent() && layerImpl->parent() && layerImpl->parent()->scrollable())
-        return layerImpl->parent();
-
-    return 0;
-}
-
 void LayerTreeHostImpl::createPendingTree()
 {
     CHECK(!m_pendingTree);
@@ -1200,7 +1183,7 @@ InputHandlerClient::ScrollStatus LayerTreeHostImpl::scrollBegin(gfx::Point viewp
             return ScrollOnMainThread;
         }
 
-        LayerImpl* scrollLayerImpl = findScrollLayerForContentLayer(layerImpl);
+        LayerImpl* scrollLayerImpl = LayerTreeHostCommon::findScrollLayerForContentLayer(layerImpl);
         if (!scrollLayerImpl)
             continue;