Add support in the network service for different contexts.

content/network/network_service_url_loader_factory_impl.h

 // Copyright 2017 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_NETWORK_NETWORK_SERVICE_URL_LOADER_FACTORY_IMPL_H_
 #define CONTENT_NETWORK_NETWORK_SERVICE_URL_LOADER_FACTORY_IMPL_H_
 
 #include "base/macros.h"
 #include "content/common/url_loader_factory.mojom.h"
 
 namespace content {
 
 class NetworkContext;
 
 // This class is an implementation of mojom::URLLoaderFactory that creates
 // a mojom::URLLoader.
 class NetworkServiceURLLoaderFactoryImpl : public mojom::URLLoaderFactory {
  public:
   // NOTE: |context| must outlive this instance.
-  explicit NetworkServiceURLLoaderFactoryImpl(NetworkContext* context);
+  NetworkServiceURLLoaderFactoryImpl(NetworkContext* context,
+                                     uint32_t process_id);
 
   ~NetworkServiceURLLoaderFactoryImpl() override;
 
   // mojom::URLLoaderFactory implementation.
   void CreateLoaderAndStart(mojom::URLLoaderAssociatedRequest request,
                             int32_t routing_id,
                             int32_t request_id,
                             uint32_t options,
                             const ResourceRequest& url_request,
                             mojom::URLLoaderClientPtr client) override;
   void SyncLoad(int32_t routing_id,
                 int32_t request_id,
                 const ResourceRequest& request,
                 SyncLoadCallback callback) override;
 
  private:
   // Not owned.
   NetworkContext* context_;
+  int process_id_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkServiceURLLoaderFactoryImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_NETWORK_NETWORK_SERVICE_URL_LOADER_FACTORY_IMPL_H_