Implement screen orientation for out-of-process iframes.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 919d333fd105979beff2e770c0b3535e76e4ca82..38daa10d170d153fb98c0981c6756f452efcec46 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -1845,6 +1845,10 @@ void WebContentsImpl::RenderWidgetWasResized(
   if (!rfh || render_widget_host != rfh->GetRenderWidgetHost())
     return;
 
+  ScreenInfo screen_info;
+  GetScreenInfo(&screen_info);
+  SendPageMessage(new PageMsg_UpdateScreenInfo(MSG_ROUTING_NONE, screen_info));
+
   for (auto& observer : observers_)
     observer.MainFrameWasResized(width_changed);
 }