cc : Move screen space scale factor to root transform node

cc/trees/property_tree.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_H_
 #define CC_TREES_PROPERTY_TREE_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 203 matching lines @@
   void set_page_scale_factor(float page_scale_factor) {
     page_scale_factor_ = page_scale_factor;
   }
   float page_scale_factor() const { return page_scale_factor_; }
 
   void set_device_scale_factor(float device_scale_factor) {
     device_scale_factor_ = device_scale_factor;
   }
   float device_scale_factor() const { return device_scale_factor_; }
 
   void SetDeviceTransform(const gfx::Transform& transform,

[jaydasika, 2016/10/11 21:54:20]

This needs to be renamed. SetContentsRootPostLocalTransform could be one. Any
better suggestions ? 

                           gfx::PointF root_position);
   void SetDeviceTransformScaleFactor(const gfx::Transform& transform);
+  void SetScreenSpaceScale(float device_scale_factor,
+                           float page_scale_factor_for_root,
+                           gfx::Transform device_transform);
+
   float device_transform_scale_factor() const {
     return device_transform_scale_factor_;
   }
 
   void UpdateInnerViewportContainerBoundsDelta();
 
   void UpdateOuterViewportContainerBoundsDelta();
 
   void AddNodeAffectedByInnerViewportBoundsDelta(int node_id);
   void AddNodeAffectedByOuterViewportBoundsDelta(int node_id);
@@ skipping 406 matching lines @@
   gfx::Vector2dF inner_viewport_container_bounds_delta_;
   gfx::Vector2dF outer_viewport_container_bounds_delta_;
   gfx::Vector2dF inner_viewport_scroll_bounds_delta_;
 
   PropertyTreesCachedData cached_data_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROPERTY_TREE_H_