cc : Calculate jitter without using layer hierarchy

cc/trees/layer_tree_host_common.h

 // Copyright 2011 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_LAYER_TREE_HOST_COMMON_H_
 #define CC_TREES_LAYER_TREE_HOST_COMMON_H_
 
 #include <stddef.h>
 
 #include <limits>
@@ skipping 100 matching lines @@
                                       const gfx::Size& device_viewport_size,
                                       const gfx::Transform& device_transform,
                                       LayerImplList* render_surface_layer_list,
                                       int current_render_surface_layer_list_id);
     CalcDrawPropsImplInputsForTesting(LayerImpl* root_layer,
                                       const gfx::Size& device_viewport_size,
                                       LayerImplList* render_surface_layer_list,
                                       int current_render_surface_layer_list_id);
   };
 
-  static int CalculateFrameJitter(LayerImpl* scrolling_layer);
+  static int CalculateLayerJitter(LayerImpl* scrolling_layer);
   static void CalculateDrawProperties(CalcDrawPropsMainInputs* inputs);
   static void PreCalculateMetaInformation(Layer* root_layer);
   static void PreCalculateMetaInformationForTesting(LayerImpl* root_layer);
   static void PreCalculateMetaInformationForTesting(Layer* root_layer);
 
   static void CalculateDrawProperties(CalcDrawPropsImplInputs* inputs);
   static void CalculateDrawProperties(
       CalcDrawPropsImplInputsForTesting* inputs);
 
   template <typename LayerType>
@@ skipping 79 matching lines @@
                            function);
   }
 }
 
 CC_EXPORT PropertyTrees* GetPropertyTrees(Layer* layer);
 CC_EXPORT PropertyTrees* GetPropertyTrees(LayerImpl* layer);
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_COMMON_H_