Prepare RFHM for disabling swapped out state.

content/browser/frame_host/render_frame_host_manager.cc

 // 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.
 
 #include "content/browser/frame_host/render_frame_host_manager.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 2561 matching lines @@
         (rvh == pending_render_view_host());
     if (rvh && rvh->IsRenderViewLive() && !need_proxy_for_pending_rvh)
       return;
 
     if (rvh && !rvh->IsRenderViewLive()) {
       EnsureRenderViewInitialized(rvh, instance);
     } else {
       // Create a swapped out RenderView in the given SiteInstance if none
       // exists. Since an opener can point to a subframe, do this on the root
       // frame of the current opener's frame tree.
-      frame_tree->root()->render_manager()->CreateRenderFrame(
-          instance, nullptr, CREATE_RF_SWAPPED_OUT | CREATE_RF_HIDDEN, nullptr);
+      if (SiteIsolationPolicy::IsSwappedOutStateForbidden()) {
+        frame_tree->root()->render_manager()->CreateRenderFrameProxy(instance);
+      } else {
+        frame_tree->root()->render_manager()->CreateRenderFrame(
+            instance, nullptr, CREATE_RF_SWAPPED_OUT | CREATE_RF_HIDDEN,
+            nullptr);
+      }
     }
   }
 }
 
 int RenderFrameHostManager::GetOpenerRoutingID(SiteInstance* instance) {
   if (!frame_tree_node_->opener())
     return MSG_ROUTING_NONE;
 
   return frame_tree_node_->opener()
       ->render_manager()
       ->GetRoutingIdForSiteInstance(instance);
 }
 
 }  // namespace content