Made top controls work with virtual viewport pinch-to-zoom. (Chromium)

cc/trees/layer_tree_impl.cc

Index: cc/trees/layer_tree_impl.cc
diff --git a/cc/trees/layer_tree_impl.cc b/cc/trees/layer_tree_impl.cc
index 172e16f9ad3c88e85cd67a9cdb03954a91966f17..33c380c2f36fee10c41c890b54462a1f3d48a868 100644
--- a/cc/trees/layer_tree_impl.cc
+++ b/cc/trees/layer_tree_impl.cc
@@ -265,6 +265,12 @@ LayerImpl* LayerTreeImpl::InnerViewportContainerLayer() const {
              : NULL;
 }
 
+LayerImpl* LayerTreeImpl::OuterViewportContainerLayer() const {
+  return outer_viewport_scroll_layer_
+             ? outer_viewport_scroll_layer_->scroll_clip_layer()
+             : NULL;
+}
+
 LayerImpl* LayerTreeImpl::CurrentlyScrollingLayer() const {
   DCHECK(IsActiveTree());
   return currently_scrolling_layer_;
@@ -366,7 +372,7 @@ gfx::SizeF LayerTreeImpl::ScrollableViewportSize() const {
   if (!InnerViewportContainerLayer())
     return gfx::SizeF();
 
-  return gfx::ScaleSize(InnerViewportContainerLayer()->bounds(),
+  return gfx::ScaleSize(InnerViewportContainerLayer()->BoundsForScrolling(),
                         1.0f / total_page_scale_factor());
 }