Plumb opener information when creating RenderFrames and RenderFrameProxies for subframes.

content/renderer/render_frame_proxy.cc

Index: content/renderer/render_frame_proxy.cc
diff --git a/content/renderer/render_frame_proxy.cc b/content/renderer/render_frame_proxy.cc
index 9f03df23ebc52d5630e615c4473ccc51f15c7899..fc6091cd5ccc6474ba97c7eabe5684fa03aadee1 100644
--- a/content/renderer/render_frame_proxy.cc
+++ b/content/renderer/render_frame_proxy.cc
@@ -59,8 +59,9 @@ RenderFrameProxy* RenderFrameProxy::CreateProxyToReplaceFrame(
 
 RenderFrameProxy* RenderFrameProxy::CreateFrameProxy(
     int routing_id,
-    int parent_routing_id,
     int render_view_routing_id,
+    int opener_routing_id,
+    int parent_routing_id,
     const FrameReplicationState& replicated_state) {
   scoped_ptr<RenderFrameProxy> proxy(
       new RenderFrameProxy(routing_id, MSG_ROUTING_NONE));
@@ -85,6 +86,10 @@ RenderFrameProxy* RenderFrameProxy::CreateFrameProxy(
     render_view = parent->render_view();
   }
 
+  blink::WebFrame* opener =
+      RenderFrameImpl::ResolveOpener(opener_routing_id, nullptr);
+  web_frame->setOpener(opener);
+
   proxy->Init(web_frame, render_view);
 
   // Initialize proxy's WebRemoteFrame with the security origin and other