Notification for device scale factor change

ui/views/view.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/view.h"
 
 #include <algorithm>
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
@@ skipping 1212 matching lines @@
     }
   }
 }
 
 void View::OnPaintLayer(gfx::Canvas* canvas) {
   if (!layer() || !layer()->fills_bounds_opaquely())
     canvas->DrawColor(SK_ColorBLACK, SkXfermode::kClear_Mode);
   PaintCommon(canvas);
 }
 
+void View::OnDeviceScaleFactorChanged(float device_scale_factor) {
+  // Repainting with new scale factor will paint the content at the right scale.
+}
+
 void View::ReorderLayers() {
   View* v = this;
   while (v && !v->layer())
     v = v->parent();
 
   // Forward to widget in case we're in a NativeWidgetAura.
   if (!v) {
     if (GetWidget())
       GetWidget()->ReorderLayers();
   } else {
@@ skipping 822 matching lines @@
   gfx::Point widget_location(event.location());
   ConvertPointToWidget(this, &widget_location);
   GetWidget()->RunShellDrag(this, data, widget_location, drag_operations);
   return true;
 #else
   return false;
 #endif  // !defined(OS_MACOSX)
 }
 
 }  // namespace views