Notification for device scale factor change

ui/aura/window.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/window.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/stl_util.h"
@@ skipping 776 matching lines @@
        it != children_.end(); ++it) {
     (*it)->NotifyAddedToRootWindow();
   }
 }
 
 void Window::OnPaintLayer(gfx::Canvas* canvas) {
   if (delegate_)
     delegate_->OnPaint(canvas);
 }
 
+void Window::OnDeviceScaleFactorChanged(float device_scale_factor) {
+  if (delegate_)
+    delegate_->OnDeviceScaleFactorChanged(device_scale_factor);
+}
+
 void Window::UpdateLayerName(const std::string& name) {
 #if !defined(NDEBUG)
   DCHECK(layer());
 
   std::string layer_name(name_);
   if (layer_name.empty())
     layer_name.append("Unnamed Window");
 
   if (id_ != -1) {
     char id_buf[10];
@@ skipping 18 matching lines @@
   for (Windows::const_reverse_iterator it = children_.rbegin(),
            rend = children_.rend();
        it != rend; ++it) {
     Window* child = *it;
     child->PrintWindowHierarchy(depth + 1);
   }
 }
 #endif
 
 }  // namespace aura