Implementation of device metrics emulation in render view.

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
===================================================================
--- content/browser/renderer_host/render_widget_host_impl.cc	(revision 217537)
+++ content/browser/renderer_host/render_widget_host_impl.cc	(working copy)
@@ -430,6 +430,7 @@
     IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateRect, OnUpdateRect)
     IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateIsDelayed, OnUpdateIsDelayed)
     IPC_MESSAGE_HANDLER(ViewHostMsg_BeginSmoothScroll, OnBeginSmoothScroll)
+    IPC_MESSAGE_HANDLER(ViewHostMsg_EmulateDevice, OnEmulateDevice)
     IPC_MESSAGE_HANDLER(ViewHostMsg_Focus, OnFocus)
     IPC_MESSAGE_HANDLER(ViewHostMsg_Blur, OnBlur)
     IPC_MESSAGE_HANDLER(ViewHostMsg_SetCursor, OnSetCursor)
@@ -1668,6 +1669,12 @@
   smooth_scroll_gesture_controller_.BeginSmoothScroll(view_, params);
 }
 
+void RenderWidgetHostImpl::OnEmulateDevice(bool enabled) {
+  if (view_)
+    view_->EmulateDevice(enabled);
+  Send(new ViewMsg_EmulateDevice_ACK(routing_id_, enabled));
+}
+
 void RenderWidgetHostImpl::OnFocus() {
   // Only RenderViewHost can deal with that message.
   RecordAction(UserMetricsAction("BadMessageTerminate_RWH4"));