cc: Move main thread hierarchy dependencies into PropertyTreeBuilder

cc/trees/property_tree_builder.h

 // Copyright 2014 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.
 
 #ifndef CC_TREES_PROPERTY_TREE_BUILDER_H_
 #define CC_TREES_PROPERTY_TREE_BUILDER_H_
 
 #include <vector>
 
 #include "cc/trees/layer_tree_host_common.h"
 #include "cc/trees/property_tree.h"
 
 namespace cc {
 
 class LayerTreeHost;
 
 class PropertyTreeBuilder {
  public:
+  static Layer* FindFirstScrollableLayer(Layer* root_layer);
+
+  static void CC_EXPORT PreCalculateMetaInformation(Layer* root_layer);
+  static void CC_EXPORT
+  PreCalculateMetaInformationForTesting(LayerImpl* root_layer);
+
   static void CC_EXPORT
   BuildPropertyTrees(Layer* root_layer,
                      const Layer* page_scale_layer,
                      const Layer* inner_viewport_scroll_layer,
                      const Layer* outer_viewport_scroll_layer,
                      const Layer* overscroll_elasticity_layer,
                      const gfx::Vector2dF& elastic_overscroll,
                      float page_scale_factor,
                      float device_scale_factor,
                      const gfx::Rect& viewport,
                      const gfx::Transform& device_transform,
                      PropertyTrees* property_trees);
   static void BuildPropertyTrees(LayerImpl* root_layer,
                                  const LayerImpl* page_scale_layer,
                                  const LayerImpl* inner_viewport_scroll_layer,
                                  const LayerImpl* outer_viewport_scroll_layer,
                                  const LayerImpl* overscroll_elasticity_layer,
                                  const gfx::Vector2dF& elastic_overscroll,
                                  float page_scale_factor,
                                  float device_scale_factor,
                                  const gfx::Rect& viewport,
                                  const gfx::Transform& device_transform,
                                  PropertyTrees* property_trees);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROPERTY_TREE_BUILDER_H_