Notification for device scale factor change

ui/views/view.h

 // 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.
 
 #ifndef UI_VIEWS_VIEW_H_
 #define UI_VIEWS_VIEW_H_
 #pragma once
 
 #include <algorithm>
 #include <map>
@@ skipping 978 matching lines @@
   // the right layer.
   virtual void MoveLayerToParent(ui::Layer* parent_layer,
                                  const gfx::Point& point);
 
   // Called to update the bounds of any child layers within this View's
   // hierarchy when something happens to the hierarchy.
   virtual void UpdateChildLayerBounds(const gfx::Point& offset);
 
   // Overridden from ui::LayerDelegate:
   virtual void OnPaintLayer(gfx::Canvas* canvas) OVERRIDE;
+  virtual void OnDeviceScaleFactorChanged(float device_scale_factor) OVERRIDE;
 
   // Finds the layer that this view paints to (it may belong to an ancestor
   // view), then reorders the immediate children of that layer to match the
   // order of the view tree.
   virtual void ReorderLayers();
 
   // This reorders the immediate children of |*parent_layer| to match the
   // order of the view tree.
   virtual void ReorderChildLayers(ui::Layer* parent_layer);
 
@@ skipping 450 matching lines @@
   base::win::ScopedComPtr<NativeViewAccessibilityWin>
       native_view_accessibility_win_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(View);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_VIEW_H_