Implementation of device metrics emulation in render view.

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
===================================================================
--- content/browser/renderer_host/render_widget_host_view_aura.cc	(revision 217537)
+++ content/browser/renderer_host/render_widget_host_view_aura.cc	(working copy)
@@ -807,6 +807,7 @@
   if (!host_->should_auto_resize() &&
       !resize_lock_.get() &&
       desired_size != current_frame_size_ &&
+      !device_emulation_enabled_ &&
       host_->is_accelerated_compositing_active()) {
     aura::RootWindow* root_window = window_->GetRootWindow();
     ui::Compositor* compositor = root_window ?
@@ -1984,6 +1985,10 @@
     touch_editing_client_->GestureEventAck(gesture_event_type);
 }
 
+void RenderWidgetHostViewAura::EmulateDevice(bool enabled) {
+  device_emulation_enabled_ = enabled;
+}
+
 void RenderWidgetHostViewAura::ProcessAckedTouchEvent(
     const TouchEventWithLatencyInfo& touch, InputEventAckState ack_result) {
   ScopedVector<ui::TouchEvent> events;