Notification for device scale factor change

ui/compositor/layer.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/compositor/layer.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 359 matching lines @@
 }
 
 void Layer::OnDeviceScaleFactorChanged(float device_scale_factor) {
   CHECK(IsDIPEnabled());
   if (device_scale_factor_ == device_scale_factor)
     return;
   device_scale_factor_ = device_scale_factor;
   RecomputeTransform();
   RecomputeDrawsContentAndUVRect();
   SchedulePaint(gfx::Rect(bounds_.size()));
+  if (delegate_)
+    delegate_->OnDeviceScaleFactorChanged(device_scale_factor);
   for (size_t i = 0; i < children_.size(); ++i)
     children_[i]->OnDeviceScaleFactorChanged(device_scale_factor);
 }
 
 void Layer::paintContents(WebKit::WebCanvas* web_canvas,
                           const WebKit::WebRect& clip) {
   TRACE_EVENT0("ui", "Layer::paintContents");
   gfx::Canvas canvas(web_canvas);
   bool scale_canvas = IsDIPEnabled() && scale_canvas_;
   if (scale_canvas) {
@@ skipping 228 matching lines @@
     return;
   unsigned int color = 0xFF000000;
   color |= web_layer_is_accelerated_ ? 0x0000FF00 : 0x00FF0000;
   bool opaque = fills_bounds_opaquely_ && (GetCombinedOpacity() == 1.f);
   if (!opaque)
     color |= 0xFF;
   web_layer_.setDebugBorderColor(color);
 }
 
 }  // namespace ui