cc: Correct scale naming in UpdateTilePriorities

cc/resources/picture_layer_tiling.h

 // Copyright 2012 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_RESOURCES_PICTURE_LAYER_TILING_H_
 #define CC_RESOURCES_PICTURE_LAYER_TILING_H_
 
 #include <utility>
 #include <vector>
 
@@ skipping 194 matching lines @@
     int bottom_;
 
     friend class PictureLayerTiling;
   };
 
   void Reset();
 
   void UpdateTilePriorities(
       WhichTree tree,
       const gfx::Rect& visible_layer_rect,
-      float layer_contents_scale,
+      float ideal_contents_scale,
       double current_frame_time_in_seconds,
       const OcclusionTracker<LayerImpl>* occlusion_tracker,
       const LayerImpl* render_target,
       const gfx::Transform& draw_transform);
 
   // Copies the src_tree priority into the dst_tree priority for all tiles.
   // The src_tree priority is reset to the lowest priority possible.  This
   // also updates the pile on each tile to be the current client's pile.
   void DidBecomeActive();
 
@@ skipping 84 matching lines @@
 
  private:
   DISALLOW_ASSIGN(PictureLayerTiling);
 
   RectExpansionCache expansion_cache_;
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_PICTURE_LAYER_TILING_H_