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

extensions/browser/guest_view/guest_view_manager.h

 // Copyright 2014 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.
 
 #ifndef EXTENSIONS_BROWSER_GUEST_VIEW_GUEST_VIEW_MANAGER_H_
 #define EXTENSIONS_BROWSER_GUEST_VIEW_GUEST_VIEW_MANAGER_H_
 
 #include <map>
 
 #include "base/gtest_prod_util.h"
@@ skipping 44 matching lines @@
       int embedder_render_process_id);
 
   // Associates the Browser Plugin with |element_instance_id| to a
   // guest that has ID of |guest_instance_id| and sets initialization
   // parameters, |params| for it.
   void AttachGuest(int embedder_process_id,
                    int element_instance_id,
                    int guest_instance_id,
                    const base::DictionaryValue& attach_params);
 
+  // Relax GetGuestByInstanceID for now, so we can wildly access a guest by
+  // its guest_instance_id.
+  content::WebContents* GetGuestByInstanceIDHack(int guest_instance_id);
+
   // Removes the association between |element_instance_id| and a guest instance
   // ID if one exists.
   void DetachGuest(GuestViewBase* guest);
 
   int GetNextInstanceID();
   int GetGuestInstanceIDForElementID(
       int owner_process_id,
       int element_instance_id);
 
   using WebContentsCreatedCallback =
@@ skipping 82 matching lines @@
   std::set<int> removed_instance_ids_;
 
   content::BrowserContext* context_;
 
   DISALLOW_COPY_AND_ASSIGN(GuestViewManager);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_GUEST_VIEW_GUEST_VIEW_MANAGER_H_