Start using RenderFrameProxyHost objects.

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 6f7bb5ef0e619773dc4abdf2ba03699650370923..ae855746b5697531dd4ebc37c2666d1dad58b2cb 100644
--- a/content/common/frame_messages.h
+++ b/content/common/frame_messages.h
@@ -333,6 +333,22 @@ IPC_MESSAGE_ROUTED2(FrameMsg_CustomContextMenuAction,
                     content::CustomContextMenuContext /* custom_context */,
                     unsigned /* action */)
 
+// Instructs the renderer to create a new RenderFrame object with |routing_id|.
+// The new frame should be created as a child of the object idendified by

[Charlie Reis, 2014/07/24 22:36:30]

identified

[kenrb, 2014/07/25 23:42:05]

Done.

+// |parent_routing_id| or as top level if the id is MSG_ROUTING_NONE.

[Charlie Reis, 2014/07/24 22:36:30]

"the id" -> that

(Assuming we're talking about parent_routing_id.  "The id" could refer to either
of the IDs.)

[kenrb, 2014/07/25 23:42:06]

Done.

+IPC_MESSAGE_CONTROL2(FrameMsg_NewFrame,
+                     int /* routing_id */,
+                     int /* parent_routing_id */)
+
+// Instructs the renderer to create a new RenderFrameProxy object with
+// |routing_id|. The new proxy should be created as a child of the object
+// idendified by |parent_routing_id| or as top level if the id is

[Charlie Reis, 2014/07/24 22:36:30]

Same as above.

[kenrb, 2014/07/25 23:42:05]

Done.

+// MSG_ROUTING_NONE.
+IPC_MESSAGE_CONTROL3(FrameMsg_NewFrameProxy,
+                     int /* routing_id */,
+                     int /* parent_routing_id */,
+                     int /* render_view_routing_id */)
+
 // Tells the renderer to perform the specified navigation, interrupting any
 // existing navigation.
 IPC_MESSAGE_ROUTED1(FrameMsg_Navigate, FrameMsg_Navigate_Params)