Initialize device scale factor correctly on Android

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 "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 141 matching lines @@
       gfx::Screen::GetScreenFor(window)->GetDisplayNearestWindow(window) :
       gfx::Screen::GetScreenFor(window)->GetPrimaryDisplay();
   results->rect = display.bounds();
   results->availableRect = display.work_area();
   // TODO(derat|oshima): Don't hardcode this. Get this from display object.
   results->depth = 24;
   results->depthPerComponent = 8;
   int default_dpi = display.device_scale_factor() * 160;
   results->verticalDPI = default_dpi;
   results->horizontalDPI = default_dpi;
+  results->deviceScaleFactor = display.device_scale_factor();
 }
 
 bool ShouldSendPinchGesture() {
   static bool pinch_allowed =
       CommandLine::ForCurrentProcess()->HasSwitch(switches::kEnableViewport) ||
       CommandLine::ForCurrentProcess()->HasSwitch(switches::kEnablePinch);
   return pinch_allowed;
 }
 
 bool ShouldReleaseFrontSurface() {
@@ skipping 1799 matching lines @@
     RenderWidgetHost* widget) {
   return new RenderWidgetHostViewAura(widget);
 }
 
 // static
 void RenderWidgetHostViewPort::GetDefaultScreenInfo(WebScreenInfo* results) {
   GetScreenInfoForWindow(results, NULL);
 }
 
 }  // namespace content