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
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index 996ec59aa4cc691d75c687f29e0f63f83322c26d..dc8fc7a3b7c2e07e55e3759f6ae27c88facac481 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -477,6 +477,7 @@ bool RenderWidgetHostImpl::OnMessageReceived(const IPC::Message &msg) {
     IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateIsDelayed, OnUpdateIsDelayed)
     IPC_MESSAGE_HANDLER(ViewHostMsg_BeginSmoothScroll, OnBeginSmoothScroll)
     IPC_MESSAGE_HANDLER(ViewHostMsg_BeginPinch, OnBeginPinch)
+    IPC_MESSAGE_HANDLER(ViewHostMsg_SetExpectedSize, OnSetExpectedSize)
     IPC_MESSAGE_HANDLER(ViewHostMsg_Focus, OnFocus)
     IPC_MESSAGE_HANDLER(ViewHostMsg_Blur, OnBlur)
     IPC_MESSAGE_HANDLER(ViewHostMsg_SetCursor, OnSetCursor)
@@ -1755,6 +1756,11 @@ void RenderWidgetHostImpl::OnBeginPinch(
   synthetic_gesture_controller_.BeginPinch(view_, params);
 }
 
+void RenderWidgetHostImpl::OnSetExpectedSize(const gfx::Size& size) {
+  if (view_)
+    view_->SetExpectedRenderedSize(size);
+}
+
 void RenderWidgetHostImpl::OnFocus() {
   // Only RenderViewHost can deal with that message.
   RecordAction(UserMetricsAction("BadMessageTerminate_RWH4"));