Add support in the network service for different contexts.

content/network/network_service_url_loader_factory_impl.h

Index: content/network/network_service_url_loader_factory_impl.h
diff --git a/content/network/network_service_url_loader_factory_impl.h b/content/network/network_service_url_loader_factory_impl.h
index 4891b16fa897b2a85bbbccff03d1936daef07325..851e71a76fc0bccb2e52742ac158d54c9e9aeaf2 100644
--- a/content/network/network_service_url_loader_factory_impl.h
+++ b/content/network/network_service_url_loader_factory_impl.h
@@ -17,7 +17,8 @@ class NetworkContext;
 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;
 
@@ -36,6 +37,7 @@ class NetworkServiceURLLoaderFactoryImpl : public mojom::URLLoaderFactory {
  private:
   // Not owned.
   NetworkContext* context_;
+  int process_id_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkServiceURLLoaderFactoryImpl);
 };