Use a utility process for the Mojo v8 proxy resolver.

chrome/browser/net/utility_process_mojo_proxy_resolver_factory.h

+// Copyright 2015 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 CHROME_BROWSER_NET_UTILITY_PROCESS_MOJO_PROXY_RESOLVER_FACTORY_H_
+#define CHROME_BROWSER_NET_UTILITY_PROCESS_MOJO_PROXY_RESOLVER_FACTORY_H_
+
+#include "base/macros.h"
+#include "net/proxy/mojo_proxy_resolver_factory.h"
+
+template <typename Type>
+struct DefaultSingletonTraits;
+
+// A factory used to create connections to Mojo proxy resolver services run in a
+// utility process. All Mojo proxy resolver services will be run in the same
+// utility process. Utility process crashes are detected and the utility
+// process is automatically restarted.
+class UtilityProcessMojoProxyResolverFactory
+    : public net::MojoProxyResolverFactory,
+      public mojo::ErrorHandler {
+ public:
+  static UtilityProcessMojoProxyResolverFactory* GetInstance();
+
+  // Overridden from net::MojoProxyResolverFactory:
+  void Create(mojo::InterfaceRequest<net::interfaces::ProxyResolver> req,
+              net::interfaces::HostResolverPtr host_resolver) override;
+
+ private:
+  friend struct DefaultSingletonTraits<UtilityProcessMojoProxyResolverFactory>;
+  UtilityProcessMojoProxyResolverFactory();
+  ~UtilityProcessMojoProxyResolverFactory() override;
+
+  // Overridden from mojo::ErrorHandler:
+  void OnConnectionError() override;
+
+  // Creates a new utility process and connects to its Mojo proxy resolver
+  // factory.
+  void CreateProcessAndConnect();
+
+  net::interfaces::ProxyResolverFactoryPtr resolver_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(UtilityProcessMojoProxyResolverFactory);
+};
+
+#endif  // CHROME_BROWSER_NET_UTILITY_PROCESS_MOJO_PROXY_RESOLVER_FACTORY_H_