Notification for device scale factor change

ui/views/widget/native_widget_aura.cc

 // Copyright (c) 2012 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/views/widget/native_widget_aura.h"
 
 #include "base/bind.h"
 #include "base/string_util.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "ui/aura/client/activation_client.h"
@@ skipping 766 matching lines @@
 }
 
 void NativeWidgetAura::OnCaptureLost() {
   delegate_->OnMouseCaptureLost();
 }
 
 void NativeWidgetAura::OnPaint(gfx::Canvas* canvas) {
   delegate_->OnNativeWidgetPaint(canvas);
 }
 
+void NativeWidgetAura::OnDeviceScaleFactorChanged(float device_scale_factor) {
+  // Repainting with new scale factor will paint the content at the right scale.
+}
+
 void NativeWidgetAura::OnWindowDestroying() {
   delegate_->OnNativeWidgetDestroying();
 
   // If the aura::Window is destroyed, we can no longer show tooltips.
   tooltip_manager_.reset();
 }
 
 void NativeWidgetAura::OnWindowDestroyed() {
   window_ = NULL;
   tooltip_manager_.reset();
@@ skipping 170 matching lines @@
   }
 }
 
 // static
 bool NativeWidgetPrivate::IsMouseButtonDown() {
   return aura::Env::GetInstance()->is_mouse_button_down();
 }
 
 }  // namespace internal
 }  // namespace views