Provide route ID via URLLoaderFactory

content/browser/loader/url_loader_factory_impl.h

 // Copyright 2016 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.
 
 #ifndef CONTENT_BROWSER_LOADER_URL_LOADER_FACTORY_IMPL_H_
 #define CONTENT_BROWSER_LOADER_URL_LOADER_FACTORY_IMPL_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
 #include "content/common/url_loader_factory.mojom.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
 
 namespace content {
 
 class ResourceMessageFilter;
 
 // This class is an implementation of mojom::URLLoaderFactory that creates
 // a mojom::URLLoader.
 class URLLoaderFactoryImpl final : public mojom::URLLoaderFactory {
  public:
   ~URLLoaderFactoryImpl() override;
 
   void CreateLoaderAndStart(mojom::URLLoaderRequest request,
+                            int32_t routing_id,
                             int32_t request_id,
                             const ResourceRequest& url_request,
                             mojom::URLLoaderClientPtr client) override;
 
   // Creates a URLLoaderFactoryImpl instance. The instance is held by the
   // StrongBinding in it, so this function doesn't return the instance.
   CONTENT_EXPORT static void Create(
       scoped_refptr<ResourceMessageFilter> resource_message_filter,
       mojom::URLLoaderFactoryRequest request);
 
  private:
   explicit URLLoaderFactoryImpl(
       scoped_refptr<ResourceMessageFilter> resource_message_filter);
 
   scoped_refptr<ResourceMessageFilter> resource_message_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(URLLoaderFactoryImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_URL_LOADER_FACTORY_IMPL_H_