Upstream the iOS web_shell and supporting code

ios/web/shell/shell_browser_state.mm

Index: ios/web/shell/shell_browser_state.mm
diff --git a/ios/web/shell/shell_browser_state.mm b/ios/web/shell/shell_browser_state.mm
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index 0000000000000000000000000000000000000000..4702b1b55e502e9301442ef54ed884ecf0891f59
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+++ b/ios/web/shell/shell_browser_state.mm
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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.
+
+#include "ios/web/shell/shell_browser_state.h"
+
+#include "base/base_paths.h"
+#include "base/files/file_path.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop.h"
+#include "base/path_service.h"
+#include "base/threading/thread_restrictions.h"
+#include "ios/web/public/web_thread.h"
+#include "ios/web/shell/shell_url_request_context_getter.h"
+
+namespace web {
+
+ShellBrowserState::ShellBrowserState() : BrowserState() {
+  CHECK(PathService::Get(base::DIR_APP_DATA, &path_));
+
+  request_context_getter_ = new ShellURLRequestContextGetter(
+      GetStatePath(),
+      web::WebThread::GetMessageLoopProxyForThread(web::WebThread::IO),
+      web::WebThread::GetMessageLoopProxyForThread(web::WebThread::FILE),
+      web::WebThread::GetMessageLoopProxyForThread(web::WebThread::CACHE));
+}
+
+ShellBrowserState::~ShellBrowserState() {
+}
+
+bool ShellBrowserState::IsOffTheRecord() const {
+  return false;
+}
+
+base::FilePath ShellBrowserState::GetStatePath() const {
+  return path_;
+}
+
+net::URLRequestContextGetter* ShellBrowserState::GetRequestContext() {
+  return request_context_getter_.get();
+}
+
+}  // namespace web