Set device scale factor in CompositorFrame and scale frame size in WS.

services/ui/ws/window_server.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 SERVICES_UI_WS_WINDOW_SERVER_H_
 #define SERVICES_UI_WS_WINDOW_SERVER_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 310 matching lines @@
   void OnTransientWindowAdded(ServerWindow* window,
                               ServerWindow* transient_child) override;
   void OnTransientWindowRemoved(ServerWindow* window,
                                 ServerWindow* transient_child) override;
 
   // GpuServiceProxyDelegate:
   void OnGpuServiceInitialized() override;
 
   // cc::mojom::DisplayCompositorClient:
   void OnSurfaceCreated(const cc::SurfaceId& surface_id,
-                        const gfx::Size& frame_size,
+                        const gfx::Size& frame_size_in_dip,

[sky, 2016/12/03 16:28:30]

Why does this function take dips?

[kylechar, 2016/12/05 14:46:11]

+1. This function receives PP values for frame_size.

                         float device_scale_factor) override;
 
   // UserIdTrackerObserver:
   void OnActiveUserIdChanged(const UserId& previously_active_id,
                              const UserId& active_id) override;
   void OnUserIdAdded(const UserId& id) override;
   void OnUserIdRemoved(const UserId& id) override;
 
   UserIdTracker user_id_tracker_;
 
@@ skipping 36 matching lines @@
   // State for rendering into a Surface.
   cc::mojom::DisplayCompositorPtr display_compositor_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowServer);
 };
 
 }  // namespace ws
 }  // namespace ui
 
 #endif  // SERVICES_UI_WS_WINDOW_SERVER_H_