Preparation steps for adding speculative renderer creation.

content/browser/web_contents/web_contents_impl.cc

 // Copyright (c) 2012 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/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 3890 matching lines @@
   // TODO(nasko): Investigate how to remove the GetActiveEntry usage here,
   // as it is deprecated and can be out of sync with GetRenderViewHost().
   GURL url = controller_.GetActiveEntry()
       ? controller_.GetActiveEntry()->GetURL() : GURL::EmptyGURL();
 
   return GetRenderManager()->current_host()->ComputeWebkitPrefs(url);
 }
 
 int WebContentsImpl::CreateSwappedOutRenderView(
     SiteInstance* instance) {
-  return GetRenderManager()->CreateRenderFrame(
-      instance, MSG_ROUTING_NONE, CREATE_RF_SWAPPED_OUT |
-                                      CREATE_RF_FOR_MAIN_FRAME_NAVIGATION |
-                                      CREATE_RF_HIDDEN);
+  int render_view_routing_id = MSG_ROUTING_NONE;
+  GetRenderManager()->CreateRenderFrame(
+      instance, MSG_ROUTING_NONE,
+      CREATE_RF_SWAPPED_OUT | CREATE_RF_FOR_MAIN_FRAME_NAVIGATION |
+          CREATE_RF_HIDDEN,
+      nullptr, &render_view_routing_id);
+  return render_view_routing_id;
 }
 
 void WebContentsImpl::OnUserGesture() {
   // Notify observers.
   FOR_EACH_OBSERVER(WebContentsObserver, observers_, DidGetUserGesture());
 
   ResourceDispatcherHostImpl* rdh = ResourceDispatcherHostImpl::Get();
   if (rdh)  // NULL in unittests.
     rdh->OnUserGesture(this);
 }
@@ skipping 151 matching lines @@
           instance)
     return GetRenderManager()->pending_render_view_host()->GetRoutingID();
 
   RenderViewHostImpl* rvh = GetRenderManager()->GetSwappedOutRenderViewHost(
       instance);
   if (rvh)
     return rvh->GetRoutingID();
 
   // Create a swapped out RenderView in the given SiteInstance if none exists,
   // setting its opener to the given route_id.  Return the new view's route_id.
-  return GetRenderManager()->CreateRenderFrame(
+  int render_view_routing_id = MSG_ROUTING_NONE;
+  GetRenderManager()->CreateRenderFrame(
       instance, opener_route_id, CREATE_RF_FOR_MAIN_FRAME_NAVIGATION |
-                                     CREATE_RF_SWAPPED_OUT | CREATE_RF_HIDDEN);
+                                     CREATE_RF_SWAPPED_OUT | CREATE_RF_HIDDEN,
+      nullptr, &render_view_routing_id);
+  return render_view_routing_id;
 }
 
 NavigationControllerImpl& WebContentsImpl::GetControllerForRenderManager() {
   return GetController();
 }
 
 WebUIImpl* WebContentsImpl::CreateWebUIForRenderManager(const GURL& url) {
   return static_cast<WebUIImpl*>(CreateWebUI(url));
 }
 
@@ skipping 254 matching lines @@
   node->render_manager()->ResumeResponseDeferredAtStart();
 }
 
 void WebContentsImpl::SetForceDisableOverscrollContent(bool force_disable) {
   force_disable_overscroll_content_ = force_disable;
   if (view_)
     view_->SetOverscrollControllerEnabled(CanOverscrollContent());
 }
 
 }  // namespace content