Scale bounds in aura-mus client-lib and NativeWidgetMus in hdpi mode.

ui/aura/mus/window_tree_host_mus.cc

 // Copyright 2015 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.
 
 #include "ui/aura/mus/window_tree_host_mus.h"
 
 #include "base/memory/ptr_util.h"
 #include "ui/aura/env.h"
 #include "ui/aura/mus/input_method_mus.h"
 #include "ui/aura/mus/window_port_mus.h"
@@ skipping 47 matching lines @@
 // window and fit in the smallest sizeof(AcceleratedWidget) uint32_t
 // has this property.
 #if defined(OS_WIN) || defined(OS_ANDROID)
     accelerated_widget =
         reinterpret_cast<gfx::AcceleratedWidget>(accelerated_widget_count++);
 #else
     accelerated_widget =
         static_cast<gfx::AcceleratedWidget>(accelerated_widget_count++);
 #endif
   }
-  // TODO(markdittmer): Use correct device-scale-factor from |window|.
-  OnAcceleratedWidgetAvailable(accelerated_widget, 1.f);
+  OnAcceleratedWidgetAvailable(accelerated_widget,
+                               display::Screen::GetScreen()
+                                   ->GetDisplayNearestWindow(window())

[sadrul, 2016/12/21 16:22:44]

Does GetDisplayNearestWindow() return the correct display? Should you use
|display_id_| to look up the display instead?

[riajiang, 2016/12/21 17:48:33]

As discussed offline, changed to use |display_id_| to get the DSF.

+                                   .device_scale_factor());
 
   delegate_->OnWindowTreeHostCreated(this);
 
   SetPlatformWindow(base::MakeUnique<ui::StubWindow>(
       this,
       false));  // Do not advertise accelerated widget; already set manually.
 
   input_method_ = base::MakeUnique<InputMethodMus>(this, window());
   input_method_->Init(window_tree_client->connector());
   SetSharedInputMethod(input_method_.get());
@@ skipping 78 matching lines @@
 void WindowTreeHostMus::OnCloseRequest() {
   OnHostCloseRequested();
 }
 
 gfx::ICCProfile WindowTreeHostMus::GetICCProfileForCurrentDisplay() {
   // TODO: This should read the profile from mus. crbug.com/647510
   return gfx::ICCProfile();
 }
 
 }  // namespace aura