Cross-process frames should be notified of device scale factor changes.

content/browser/renderer_host/render_widget_host_view_aura.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 "content/browser/renderer_host/render_widget_host_view_aura.h"
 
 #include <set>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 1706 matching lines @@
 void RenderWidgetHostViewAura::OnPaint(const ui::PaintContext& context) {
   NOTREACHED();
 }
 
 void RenderWidgetHostViewAura::OnDeviceScaleFactorChanged(
     float device_scale_factor) {
   // TODO(wjmaclean): can host_ ever be null?
   if (!host_ || !window_->GetRootWindow())
     return;
 
-  UpdateScreenInfo(window_);
+  RenderWidgetHostImpl* host =
+      RenderWidgetHostImpl::From(GetRenderWidgetHost());
+  if (host && host->delegate())
+    host->delegate()->UpdateDeviceScaleFactor(device_scale_factor);
 
   device_scale_factor_ = device_scale_factor;
   const display::Display display =
       display::Screen::GetScreen()->GetDisplayNearestWindow(window_);
   DCHECK_EQ(device_scale_factor, display.device_scale_factor());
   current_cursor_.SetDisplayInfo(display);
   SnapToPhysicalPixelBoundary();
 }
 
 void RenderWidgetHostViewAura::OnWindowDestroying(aura::Window* window) {
@@ skipping 1263 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewBase, public:
 
 // static
 void RenderWidgetHostViewBase::GetDefaultScreenInfo(WebScreenInfo* results) {
   GetScreenInfoForWindow(results, NULL);
 }
 
 }  // namespace content