Move MaxScrollOffset to property_trees

cc/layers/layer.cc

Index: cc/layers/layer.cc
diff --git a/cc/layers/layer.cc b/cc/layers/layer.cc
index 2430f9ca74906d6c7b9eb46a3441a561bfb318b1..1f810c3d577c62c374a42571781e183dd08e6cb6 100644
--- a/cc/layers/layer.cc
+++ b/cc/layers/layer.cc
@@ -373,7 +373,13 @@ void Layer::SetBounds(const gfx::Size& size) {
     }
   }
 
-  SetNeedsCommitNoRebuild();
+  ScrollNode* scroll_node =
+      layer_tree_host_->property_trees()->scroll_tree.Node(scroll_tree_index());
+  if (scroll_node && scroll_node->owner_id == id()) {
+    scroll_node->data.bounds = size;

[sunxd, 2016/02/09 00:11:32]

I will delete this part, as we now force a rebuild.

+  }
+
+  SetNeedsCommit();
 }
 
 Layer* Layer::RootLayer() {
@@ -942,6 +948,10 @@ void Layer::SetScrollClipLayerId(int clip_layer_id) {
   SetNeedsCommit();
 }
 
+Layer* Layer::scroll_clip_layer() const {
+  return layer_tree_host()->LayerById(scroll_clip_layer_id_);
+}
+
 void Layer::SetUserScrollable(bool horizontal, bool vertical) {
   DCHECK(IsPropertyChangeAllowed());
   if (user_scrollable_horizontal_ == horizontal &&