cc: Ensure pending tree needs prop updates when active tree scrolls.

cc/layers/layer_impl.cc

Index: cc/layers/layer_impl.cc
diff --git a/cc/layers/layer_impl.cc b/cc/layers/layer_impl.cc
index c47e50cfa46c6e9a75a69743dc19619456566201..a8d698422c399ae012ccc0a7c24c97e18a504951 100644
--- a/cc/layers/layer_impl.cc
+++ b/cc/layers/layer_impl.cc
@@ -1221,6 +1221,13 @@ void LayerImpl::DidUpdateScrollOffset(bool is_from_root_delegate) {
     layer_tree_impl()->DidUpdateScrollOffset(id());
   NoteLayerPropertyChangedForSubtree();
   ScrollbarParametersDidChange(false);
+  if (layer_tree_impl()->IsActiveTree()) {
+    LayerImpl* pending_twin = layer_tree_impl()->FindPendingTreeLayerById(id());
+    if (pending_twin) {
+      pending_twin->NoteLayerPropertyChangedForSubtree();
+      pending_twin->ScrollbarParametersDidChange(false);

[aelias_OOO_until_Jul13, 2015/05/08 21:44:00]

I don't think this line is needed, pending tree scrollbars aren't relevant.

[vmpstr, 2015/05/11 18:36:15]

Removed.

+    }
+  }
 }
 
 void LayerImpl::SetDoubleSided(bool double_sided) {