Plumb opener information when creating RenderFrames and RenderFrameProxies for subframes.

content/common/frame_messages.h

Index: content/common/frame_messages.h
diff --git a/content/common/frame_messages.h b/content/common/frame_messages.h
index 28f27db5245bbcb1507885ac71efa58a66915e4e..67c3393575c03eaa9bd075425615e9e9fa659e1d 100644
--- a/content/common/frame_messages.h
+++ b/content/common/frame_messages.h
@@ -337,6 +337,10 @@ IPC_STRUCT_BEGIN(FrameMsg_NewFrame_Params)
   // configured to replace the proxy on commit.
   IPC_STRUCT_MEMBER(int, proxy_routing_id)
 
+  // Specifies the new frame's opener.  The opener will be null if this is
+  // MSG_ROUTING_NONE.
+  IPC_STRUCT_MEMBER(int, opener_routing_id)
+
   // When the new frame has a parent, |replication_state| holds the new frame's
   // properties replicated from the process rendering the parent frame, such as
   // the new frame's sandbox flags.
@@ -455,10 +459,12 @@ IPC_MESSAGE_CONTROL1(FrameMsg_NewFrame, FrameMsg_NewFrame_Params /* params */)
 // Instructs the renderer to create a new RenderFrameProxy object with
 // |routing_id|. The new proxy should be created as a child of the object
 // identified by |parent_routing_id| or as top level if that is
-// MSG_ROUTING_NONE.
-IPC_MESSAGE_CONTROL4(FrameMsg_NewFrameProxy,
+// MSG_ROUTING_NONE.  The new proxy's opener should be set to the object
+// identified by |opener_routing_id|, or to null if that is MSG_ROUTING_NONE.
+IPC_MESSAGE_CONTROL5(FrameMsg_NewFrameProxy,
                      int /* routing_id */,
                      int /* parent_routing_id */,
+                     int /* opener_routing_id */,
                      int /* render_view_routing_id */,
                      content::FrameReplicationState /* replication_state */)