Seems incorrect to se device_scale_factor in SetLocalSurfaceId.

cc/surfaces/display.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_SURFACES_DISPLAY_H_
 #define CC_SURFACES_DISPLAY_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 47 matching lines @@
           const FrameSinkId& frame_sink_id,
           BeginFrameSource* begin_frame_source,
           std::unique_ptr<OutputSurface> output_surface,
           std::unique_ptr<DisplayScheduler> scheduler,
           std::unique_ptr<TextureMailboxDeleter> texture_mailbox_deleter);
 
   ~Display() override;
 
   void Initialize(DisplayClient* client, SurfaceManager* surface_manager);
 
+  void SetLocalSurfaceId(const LocalSurfaceId& id);
   // device_scale_factor is used to communicate to the external window system
   // what scale this was rendered at.
-  void SetLocalSurfaceId(const LocalSurfaceId& id, float device_scale_factor);
+  void SetDeviceScaleFactor(float device_scale_factor);
   void SetVisible(bool visible);
   void Resize(const gfx::Size& new_size);
   void SetColorSpace(const gfx::ColorSpace& color_space);
   void SetOutputIsSecure(bool secure);
 
   const SurfaceId& CurrentSurfaceId();
 
   // DisplaySchedulerClient implementation.
   bool DrawAndSwap() override;
 
@@ skipping 44 matching lines @@
   SoftwareRenderer* software_renderer_ = nullptr;
   std::vector<ui::LatencyInfo> stored_latency_info_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Display);
 };
 
 }  // namespace cc
 
 #endif  // CC_SURFACES_DISPLAY_H_