ResourceScheduler should use renderer notifications instead of MRUCache to track renderers.

content/browser/loader/resource_dispatcher_host_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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 
 #include <set>
 #include <vector>
@@ skipping 1156 matching lines @@
     const std::string& http_method,
     const std::string& mime_type,
     ResourceType::Type resource_type) {
   if (!url.is_valid() || !(url.SchemeIs("http") || url.SchemeIs("https")))
     return;
 
   filter_->GetURLRequestContext(resource_type)->http_transaction_factory()->
       GetCache()->OnExternalCacheHit(url, http_method);
 }
 
+void ResourceDispatcherHostImpl::OnRenderViewHostCreated(
+    int child_id,
+    int route_id) {
+  scheduler_->OnClientCreated(child_id, route_id);
+}
+
+void ResourceDispatcherHostImpl::OnRenderViewHostDeleted(
+    int child_id,
+    int route_id) {
+  scheduler_->OnClientDeleted(child_id, route_id);
+  CancelRequestsForRoute(child_id, route_id);
+}
+
 // This function is only used for saving feature.
 void ResourceDispatcherHostImpl::BeginSaveFile(
     const GURL& url,
     const Referrer& referrer,
     int child_id,
     int route_id,
     ResourceContext* context) {
   if (is_shutdown_)
     return;
 
@@ skipping 510 matching lines @@
   DelegateMap::iterator it = delegate_map_.find(id);
   DCHECK(it->second->HasObserver(delegate));
   it->second->RemoveObserver(delegate);
   if (it->second->size() == 0) {
     delete it->second;
     delegate_map_.erase(it);
   }
 }
 
 }  // namespace content