Add a ResourceScheduler to ResourceDispatcherHost.

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 1034 matching lines @@
                                 is_continuation_of_transferred_request,
                                 &throttles);
   }
 
   if (request_data.resource_type == ResourceType::MAIN_FRAME) {
     throttles.insert(
         throttles.begin(),
         new TransferNavigationResourceThrottle(request));
   }
 
-  if (!throttles.empty()) {
-    handler.reset(
-        new ThrottlingResourceHandler(handler.Pass(), child_id, request_id,
-                                      throttles.Pass()));
-  }
+  throttles.push_back(scheduler_.ScheduleRequest(child_id, route_id,

[darin (slow to review), 2013/01/14 22:03:30]

nit: might read slightly better as:

  throttles.push_back(
      scheduler_.ScheduleRequest(child_id, route_id, *request).release());

[James Simonsen, 2013/01/15 01:10:06]

Done.

+                                                 *request).release());
+
+  handler.reset(
+      new ThrottlingResourceHandler(handler.Pass(), child_id, request_id,
+                                    throttles.Pass()));
 
   if (deferred_loader.get()) {
     pending_loaders_[extra_info->GetGlobalRequestID()] = deferred_loader;
     deferred_loader->CompleteTransfer(handler.Pass());
   } else {
     BeginRequestInternal(new_request.Pass(), handler.Pass());
   }
 }
 
 void ResourceDispatcherHostImpl::OnReleaseDownloadedFile(int request_id) {
@@ skipping 652 matching lines @@
 
   return i->second.get();
 }
 
 ResourceLoader* ResourceDispatcherHostImpl::GetLoader(int child_id,
                                                       int request_id) const {
   return GetLoader(GlobalRequestID(child_id, request_id));
 }
 
 }  // namespace content