Add pending preloads indexed by routing id. Start preloading once we navigate.

content/browser/renderer_host/resource_dispatcher_host.cc

 // Copyright (c) 2011 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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #include "content/browser/renderer_host/resource_dispatcher_host.h"
 
 #include <set>
 #include <vector>
@@ skipping 443 matching lines @@
   if (request_data.upload_data) {
     request->set_upload(request_data.upload_data);
     upload_size = request_data.upload_data->GetContentLength();
   }
 
   // Install a PrerenderResourceHandler if the requested URL could
   // be prerendered. This should be in front of the [a]syncResourceHandler,
   // but after the BufferedResourceHandler since it depends on the MIME
   // sniffing capabilities in the BufferedResourceHandler.
   prerender::PrerenderResourceHandler* pre_handler =
-      prerender::PrerenderResourceHandler::MaybeCreate(*request,
-                                                       context,
-                                                       handler);
+      prerender::PrerenderResourceHandler::MaybeCreate(
+          *request,
+          context,
+          handler,
+          ((load_flags & net::LOAD_PRERENDER) != 0),
+          child_id, route_id);
   if (pre_handler)
     handler = pre_handler;
 
   // Install a CrossSiteResourceHandler if this request is coming from a
   // RenderViewHost with a pending cross-site request.  We only check this for
   // MAIN_FRAME requests. Unblock requests only come from a blocked page, do
   // not count as cross-site, otherwise it gets blocked indefinitely.
   if (request_data.resource_type == ResourceType::MAIN_FRAME &&
       process_type == ChildProcessInfo::RENDER_PROCESS &&
       CrossSiteRequestManager::GetInstance()->
@@ skipping 1464 matching lines @@
   return is_prefetch_enabled_;
 }
 
 // static
 void ResourceDispatcherHost::set_is_prefetch_enabled(bool value) {
   is_prefetch_enabled_ = value;
 }
 
 // static
 bool ResourceDispatcherHost::is_prefetch_enabled_ = false;