Plumb opener information when creating RenderFrames and RenderFrameProxies for subframes.

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 7130c25e63a1370a7978d7605b91a3a20fdd7c95..8bde4af83786a90bcfde12b56f2ac1cf7e699675 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -582,9 +582,10 @@ RenderFrameImpl* RenderFrameImpl::CreateMainFrame(RenderViewImpl* render_view,
 // static
 void RenderFrameImpl::CreateFrame(
     int routing_id,
+    int proxy_routing_id,
+    int opener_routing_id,
     int parent_routing_id,
     int previous_sibling_routing_id,
-    int proxy_routing_id,
     const FrameReplicationState& replicated_state,
     CompositorDependencies* compositor_deps,
     const FrameMsg_NewFrame_WidgetParams& widget_params) {
@@ -626,6 +627,9 @@ void RenderFrameImpl::CreateFrame(
   render_frame->SetWebFrame(web_frame);
   CHECK_IMPLIES(parent_routing_id == MSG_ROUTING_NONE, !web_frame->parent());
 
+  WebFrame* opener = ResolveOpener(opener_routing_id, nullptr);
+  web_frame->setOpener(opener);
+
   if (widget_params.routing_id != MSG_ROUTING_NONE) {
     CHECK(SiteIsolationPolicy::AreCrossProcessFramesPossible());
     render_frame->render_widget_ = RenderWidget::CreateForFrame(