Notification for device scale factor change

ui/aura/test/test_window_delegate.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/aura/test/test_window_delegate.h"
 
 #include "ui/aura/event.h"
 #include "ui/aura/window.h"
 #include "ui/base/hit_test.h"
 #include "ui/gfx/canvas.h"
@@ skipping 51 matching lines @@
 bool TestWindowDelegate::CanFocus() {
   return true;
 }
 
 void TestWindowDelegate::OnCaptureLost() {
 }
 
 void TestWindowDelegate::OnPaint(gfx::Canvas* canvas) {
 }
 
+void TestWindowDelegate::OnDeviceScaleFactorChanged(
+    float device_scale_factor) {
+}
+
 void TestWindowDelegate::OnWindowDestroying() {
 }
 
 void TestWindowDelegate::OnWindowDestroyed() {
 }
 
 void TestWindowDelegate::OnWindowVisibilityChanged(bool visible) {
 }
 
 
@@ skipping 13 matching lines @@
 }
 void ColorTestWindowDelegate::OnWindowDestroyed() {
   delete this;
 }
 void ColorTestWindowDelegate::OnPaint(gfx::Canvas* canvas) {
   canvas->DrawColor(color_, SkXfermode::kSrc_Mode);
 }
 
 }  // namespace test
 }  // namespace aura