Allow use of Mojo/V8 ProxyResolvers with URLRequestContextBuilder.

net/proxy/test_mojo_proxy_resolver_factory.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 NET_PROXY_TEST_MOJO_PROXY_RESOLVER_FACTORY_H_
+#define NET_PROXY_TEST_MOJO_PROXY_RESOLVER_FACTORY_H_
+
+#include <memory>
+#include <string>
+
+#include "base/macros.h"
+#include "base/memory/singleton.h"
+#include "net/proxy/mojo_proxy_resolver_factory.h"
+
+namespace net {
+
+// MojoProxyResolverFactory that runs PAC scripts in-process, for tests.
+class TestMojoProxyResolverFactory : public MojoProxyResolverFactory {

[mmenke, 2017/05/12 17:19:40]

This is just InProcessMojoProxyResolverFactory, from
proxy_service_mojo_unittest.cc

+ public:
+  static TestMojoProxyResolverFactory* GetInstance();
+
+  // Returns true if CreateResolver was called.
+  bool resolver_created() { return resolver_created_; }
+
+  // Sets the value returned by resolver_created. Since this is a singleton,
+  // Serves to avoid with test fixture reuse.
+  void set_resolver_created(bool resolver_created) {
+    resolver_created_ = resolver_created;
+  }
+
+  // Overridden from MojoProxyResolverFactory:
+  std::unique_ptr<base::ScopedClosureRunner> CreateResolver(
+      const std::string& pac_script,
+      mojo::InterfaceRequest<interfaces::ProxyResolver> req,
+      interfaces::ProxyResolverFactoryRequestClientPtr client) override;
+
+ private:
+  TestMojoProxyResolverFactory();
+  ~TestMojoProxyResolverFactory() override;
+
+  friend struct base::DefaultSingletonTraits<TestMojoProxyResolverFactory>;
+
+  interfaces::ProxyResolverFactoryPtr factory_;
+
+  bool resolver_created_ = false;
+
+  DISALLOW_COPY_AND_ASSIGN(TestMojoProxyResolverFactory);
+};
+
+}  // namespace net
+
+#endif  // NET_PROXY_TEST_MOJO_PROXY_RESOLVER_FACTORY_H_