Notification for device scale factor change

ash/wm/image_grid.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 "ash/wm/image_grid.h"
 
 #include <algorithm>
 
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/image/image.h"
@@ skipping 212 matching lines @@
     layer->SchedulePaint(layer->bounds());
   }
 }
 
 void ImageGrid::ImagePainter::OnPaintLayer(gfx::Canvas* canvas) {
   if (!clip_rect_.IsEmpty())
     canvas->ClipRect(clip_rect_);
   canvas->DrawBitmapInt(*(image_->ToSkBitmap()), 0, 0);
 }
 
+void ImageGrid::ImagePainter::OnDeviceScaleFactorChanged(
+    float device_scale_factor) {
+  // Redrawing will take care of scale factor change.
+}
+
 // static
 gfx::Size ImageGrid::GetImageSize(const gfx::Image* image) {
   return image ?
       gfx::Size(image->ToSkBitmap()->width(), image->ToSkBitmap()->height()) :
       gfx::Size();
 }
 
 // static
 bool ImageGrid::LayerExceedsSize(const ui::Layer* layer,
                                  const gfx::Size& size) {
@@ skipping 22 matching lines @@
 
   painter_ptr->reset(new ImagePainter(image));
   layer_ptr->get()->set_delegate(painter_ptr->get());
   layer_ptr->get()->SetFillsBoundsOpaquely(false);
   layer_ptr->get()->SetVisible(true);
   layer_->Add(layer_ptr->get());
 }
 
 }  // namespace internal
 }  // namespace ash