Move MaxScrollOffset to property_trees

cc/layers/layer.cc

 // Copyright 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layers/layer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 355 matching lines @@
     return;
 
   if (ClipNode* clip_node = layer_tree_host_->property_trees()->clip_tree.Node(
           clip_tree_index())) {
     if (clip_node->owner_id == id()) {
       clip_node->data.clip.set_size(gfx::SizeF(size));
       layer_tree_host_->property_trees()->clip_tree.set_needs_update(true);
     }
   }
 
-  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() {
   Layer* layer = this;
   while (layer->parent())
     layer = layer->parent();
   return layer;
 }
 
 void Layer::RemoveAllChildren() {
@@ skipping 548 matching lines @@
 }
 
 void Layer::SetScrollClipLayerId(int clip_layer_id) {
   DCHECK(IsPropertyChangeAllowed());
   if (scroll_clip_layer_id_ == clip_layer_id)
     return;
   scroll_clip_layer_id_ = 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 &&
       user_scrollable_vertical_ == vertical)
     return;
   user_scrollable_horizontal_ = horizontal;
   user_scrollable_vertical_ = vertical;
   SetNeedsCommit();
 }
 
@@ skipping 1084 matching lines @@
       this, layer_tree_host_->property_trees()->transform_tree);
 }
 
 gfx::Transform Layer::screen_space_transform() const {
   DCHECK_NE(transform_tree_index_, -1);
   return ScreenSpaceTransformFromPropertyTrees(
       this, layer_tree_host_->property_trees()->transform_tree);
 }
 
 }  // namespace cc