Seems incorrect to se device_scale_factor in SetLocalSurfaceId.

cc/ipc/display_compositor.mojom

 // Copyright 2016 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.
 
 module cc.mojom;
 
 import "cc/ipc/frame_sink_id.mojom";
 import "cc/ipc/local_surface_id.mojom";
 import "cc/ipc/mojo_compositor_frame_sink.mojom";
 import "cc/ipc/surface_id.mojom";
 import "cc/ipc/surface_info.mojom";
 import "gpu/ipc/common/surface_handle.mojom";
 import "mojo/common/time.mojom";
 import "ui/gfx/geometry/mojo/geometry.mojom";
 import "ui/gfx/mojo/color_space.mojom";
 
 // See ui/compositor/compositor.h: ContextFactoryPrivate.
 // The DisplayPrivate is used by privileged clients to talk to cc::Display.
 // DisplayPrivate would eventually replace or be used by ContextFactoryPrivate.
 interface DisplayPrivate {
   SetDisplayVisible(bool visible);
   ResizeDisplay(gfx.mojom.Size size_in_pixel);
   SetDisplayColorSpace(gfx.mojom.ColorSpace color_space);
   SetOutputIsSecure(bool secure);
-  SetLocalSurfaceId(cc.mojom.LocalSurfaceId local_surface_id,
-                    float scale_factor);
+  SetLocalSurfaceId(cc.mojom.LocalSurfaceId local_surface_id);
+  SetDeviceScaleFactor(float scale_factor);
 };
 
 // The DisplayCompositor interface is a privileged interface that allows
 // the display compositor host (browser or window server) to create
 // CompositorFrameSinks. Clients acquire a CompositorFrameSink connection
 // through the display compositor host. Clients request a
 // MojoCompositorFrameSink interface, and implement a
 // MojoCompositorFrameSinkClient interface. The display compositor host
 // holds one or more root CompositorFrameSinks that are tied to a valid
 // |surface_handle|. All other CompositorFrameSinks are offscreen. FrameSinkIds
@@ skipping 24 matching lines @@
 
 // The DisplayCompositorClient interface is implemented by the Display
 // Compositor Host, a stable, and privileged peer service to the display
 // compositor. The display compositor host is either the browser process in
 // Chrome or the window server process.
 interface DisplayCompositorClient {
   // Called by the display compositor immediately upon receiving a
   // CompositorFrame with a new SurfaceId for the first time.
   OnSurfaceCreated(SurfaceInfo surface_info);
 };