Seems incorrect to se device_scale_factor in SetLocalSurfaceId.

components/display_compositor/gpu_root_compositor_frame_sink.h

 // Copyright 2017 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 COMPONENTS_DISPLAY_COMPOSITOR_GPU_ROOT_COMPOSITOR_FRAME_SINK_H_
 #define COMPONENTS_DISPLAY_COMPOSITOR_GPU_ROOT_COMPOSITOR_FRAME_SINK_H_
 
 #include "cc/ipc/display_compositor.mojom.h"
 #include "cc/ipc/mojo_compositor_frame_sink.mojom.h"
 #include "cc/surfaces/compositor_frame_sink_support_client.h"
@@ skipping 33 matching lines @@
       cc::mojom::MojoCompositorFrameSinkClientPtr client,
       cc::mojom::DisplayPrivateAssociatedRequest display_private_request);
 
   ~GpuRootCompositorFrameSink() override;
 
   // cc::mojom::DisplayPrivate:
   void SetDisplayVisible(bool visible) override;
   void ResizeDisplay(const gfx::Size& size) override;
   void SetDisplayColorSpace(const gfx::ColorSpace& color_space) override;
   void SetOutputIsSecure(bool secure) override;
-  void SetLocalSurfaceId(const cc::LocalSurfaceId& local_surface_id,
-                         float scale_factor) override;
+  void SetLocalSurfaceId(const cc::LocalSurfaceId& local_surface_id) override;
+  void SetDeviceScaleFactor(float scale_factor) override;
 
   // cc::mojom::MojoCompositorFrameSink:
   void EvictFrame() override;
   void SetNeedsBeginFrame(bool needs_begin_frame) override;
   void SubmitCompositorFrame(const cc::LocalSurfaceId& local_surface_id,
                              cc::CompositorFrame frame) override;
   void Require(const cc::LocalSurfaceId& local_surface_id,
                const cc::SurfaceSequence& sequence) override;
   void Satisfy(const cc::SurfaceSequence& sequence) override;
 
@@ skipping 38 matching lines @@
   mojo::Binding<cc::mojom::MojoCompositorFrameSinkPrivate>
       compositor_frame_sink_private_binding_;
   mojo::AssociatedBinding<cc::mojom::DisplayPrivate> display_private_binding_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuRootCompositorFrameSink);
 };
 
 }  // namespace display_compositor
 
 #endif  // COMPONENTS_DISPLAY_COMPOSITOR_GPU_ROOT_COMPOSITOR_FRAME_SINK_H_