Make RenderFrame(Host) own a RenderWidget(Host).

content/common/frame_messages.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // IPC messages for interacting with frames.
 // Multiply-included message file, hence no include guard.
 
 #include "content/common/content_export.h"
 #include "content/common/content_param_traits.h"
 #include "content/common/frame_message_enums.h"
@@ skipping 155 matching lines @@
   // We need to track the RenderViewHost routing_id because of downstream
   // dependencies (crbug.com/392171 DownloadRequestHandle, SaveFileManager,
   // ResourceDispatcherHostImpl, MediaStreamUIProxy,
   // SpeechRecognitionDispatcherHost and possibly others). They look up the view
   // based on the ID stored in the resource requests. Once those dependencies
   // are unwound or moved to RenderFrameHost (crbug.com/304341) we can move the
   // client to be based on the routing_id of the RenderFrameHost.
   IPC_STRUCT_MEMBER(int, render_view_routing_id)
 IPC_STRUCT_END()
 
+IPC_STRUCT_BEGIN(FrameMsg_NewFrame_WidgetParams)
+  // Gives the routing ID for the RenderWidget that will be attached to the
+  // new RenderFrame. If the RenderFrame does not need a RenderWidget, this
+  // is MSG_ROUTING_NONE and the other parameters are not read.
+  IPC_STRUCT_MEMBER(int, routing_id)
+
+  // Identifier for the output surface for the new RenderWidget.
+  IPC_STRUCT_MEMBER(int, surface_id)
+
+  // Tells the new RenderWidget whether it is initially hidden.
+  IPC_STRUCT_MEMBER(bool, hidden)
+IPC_STRUCT_END()
+
 IPC_STRUCT_BEGIN(FrameMsg_Navigate_Params)
   // The page_id for this navigation, or -1 if it is a new navigation.  Back,
   // Forward, and Reload navigations should have a valid page_id.  If the load
   // succeeds, then this page_id will be reflected in the resultant
   // FrameHostMsg_DidCommitProvisionalLoad message.
   IPC_STRUCT_MEMBER(int32, page_id)
 
   // If page_id is -1, then pending_history_list_offset will also be -1.
   // Otherwise, it contains the offset into the history list corresponding to
   // the current navigation.
@@ skipping 175 matching lines @@
 IPC_MESSAGE_ROUTED2(FrameMsg_CustomContextMenuAction,
                     content::CustomContextMenuContext /* custom_context */,
                     unsigned /* action */)
 
 // Requests that the RenderFrame or RenderFrameProxy sets its opener to null.
 IPC_MESSAGE_ROUTED0(FrameMsg_DisownOpener)
 
 // Instructs the renderer to create a new RenderFrame object with |routing_id|.
 // The new frame 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_CONTROL2(FrameMsg_NewFrame,
+IPC_MESSAGE_CONTROL3(FrameMsg_NewFrame,
                      int /* routing_id */,
-                     int /* parent_routing_id */)
+                     int /* parent_routing_id */,
+                     FrameMsg_NewFrame_WidgetParams /* params */)

[nasko, 2014/10/02 20:41:44]

nit: widget_params

[kenrb, 2014/10/03 17:23:32]

Done.

 
 // 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_CONTROL3(FrameMsg_NewFrameProxy,
                      int /* routing_id */,
                      int /* parent_routing_id */,
                      int /* render_view_routing_id */)
 
@@ skipping 369 matching lines @@
 IPC_MESSAGE_ROUTED0(FrameHostMsg_DidFirstVisuallyNonEmptyPaint)
 
 #if defined(OS_MACOSX) || defined(OS_ANDROID)
 
 // Message to show/hide a popup menu using native controls.
 IPC_MESSAGE_ROUTED1(FrameHostMsg_ShowPopup,
                     FrameHostMsg_ShowPopup_Params)
 IPC_MESSAGE_ROUTED0(FrameHostMsg_HidePopup)
 
 #endif