Make <webview> use out-of-process iframe architecture.

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 528 matching lines @@
 // PlzNavigate
 // Tells the renderer that a navigation is ready to commit.  The renderer should
 // request |stream_url| to get access to the stream containing the body of the
 // response.
 IPC_MESSAGE_ROUTED4(FrameMsg_CommitNavigation,
                     content::ResourceResponseHead, /* response */
                     GURL, /* stream_url */
                     content::CommonNavigationParams, /* common_params */
                     content::CommitNavigationParams /* commit_params */)
 
+// Replace this frame with a RenderFrameProxy whose routing ID is

[Charlie Reis, 2015/03/10 04:09:45]

Isn't this essentially what swap does?

[lazyboy, 2015/04/01 21:47:58]

More or less, it does subset of swap.
Swap disconnects the local frame, but I'm keeping it around.
Haven't got to try out disconnecting the frame yet.

+// |proxy_routing_id|.
+IPC_MESSAGE_ROUTED1(FrameMsg_ReplaceLocalFrameWithProxy,
+                    int32 /* proxy_routing_id */)
+
 #if defined(ENABLE_PLUGINS)
 // Notifies the renderer of updates to the Plugin Power Saver origin whitelist.
 IPC_MESSAGE_ROUTED1(FrameMsg_UpdatePluginContentOriginWhitelist,
                     std::set<GURL> /* origin_whitelist */)
 #endif  // defined(ENABLE_PLUGINS)
 
 // -----------------------------------------------------------------------------
 // Messages sent from the renderer to the browser.
 
 // Blink and JavaScript error messages to log to the console
@@ skipping 303 matching lines @@
                     bool /* present */)
 
 #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