[UseZoomForDSF] Guest view support

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index bc43dc39a3be545f3d88307cc15e0e988d125049..9030b267c60a3960a91b3d6dd5ac5291c14eb7c8 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -2134,6 +2134,12 @@ int RenderFrameImpl::ShowContextMenu(ContextMenuClient* client,
                                      const ContextMenuParams& params) {
   DCHECK(client);  // A null client means "internal" when we issue callbacks.
   ContextMenuParams our_params(params);
+
+  blink::WebRect position_in_window(params.x, params.y, 0, 0);
+  GetRenderWidget()->convertViewportToWindow(&position_in_window);
+  our_params.x = position_in_window.x;
+  our_params.y = position_in_window.y;
+
   our_params.custom_context.request_id = pending_context_menus_.Add(client);
   Send(new FrameHostMsg_ContextMenu(routing_id_, our_params));
   return our_params.custom_context.request_id;