Upstream the iOS web_shell and supporting code

ios/web/shell/shell_url_request_context_getter.h

Index: ios/web/shell/shell_url_request_context_getter.h
diff --git a/ios/web/shell/shell_url_request_context_getter.h b/ios/web/shell/shell_url_request_context_getter.h
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+// Copyright 2014 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 IOS_WEB_SHELL_SHELL_URL_REQUEST_CONTEXT_GETTER_H_
+#define IOS_WEB_SHELL_SHELL_URL_REQUEST_CONTEXT_GETTER_H_
+
+#include "base/compiler_specific.h"
+#include "base/files/file_path.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop_proxy.h"
+#include "base/single_thread_task_runner.h"
+#include "net/url_request/url_request_context_getter.h"
+
+namespace net {
+class HostResolver;
+class MappedHostResolver;
+class NetworkDelegate;
+class NetLog;
+class ProxyConfigService;
+class TransportSecurityPersister;
+class URLRequestContext;
+class URLRequestContextStorage;
+}
+
+namespace web {
+
+class ShellURLRequestContextGetter : public net::URLRequestContextGetter {
+ public:
+  ShellURLRequestContextGetter(
+      const base::FilePath& base_path,
+      const scoped_refptr<base::SingleThreadTaskRunner>& network_task_runner,
+      const scoped_refptr<base::SingleThreadTaskRunner>& file_task_runner,
+      const scoped_refptr<base::MessageLoopProxy>& cache_task_runner);
+
+  // net::URLRequestContextGetter implementation.
+  net::URLRequestContext* GetURLRequestContext() override;
+  scoped_refptr<base::SingleThreadTaskRunner> GetNetworkTaskRunner()
+      const override;
+
+ protected:
+  ~ShellURLRequestContextGetter() override;
+
+ private:
+  base::FilePath base_path_;
+  scoped_refptr<base::SingleThreadTaskRunner> file_task_runner_;
+  scoped_refptr<base::SingleThreadTaskRunner> network_task_runner_;
+  scoped_refptr<base::MessageLoopProxy> cache_task_runner_;
+  scoped_ptr<net::ProxyConfigService> proxy_config_service_;
+  scoped_ptr<net::NetworkDelegate> network_delegate_;
+  scoped_ptr<net::URLRequestContextStorage> storage_;
+  scoped_ptr<net::URLRequestContext> url_request_context_;
+  scoped_ptr<net::NetLog> net_log_;
+  scoped_ptr<net::TransportSecurityPersister> transport_security_persister_;
+
+  DISALLOW_COPY_AND_ASSIGN(ShellURLRequestContextGetter);
+};
+
+}  // namespace web
+
+#endif  // IOS_WEB_SHELL_SHELL_URL_REQUEST_CONTEXT_GETTER_H_