Initialize ios/web_view translate with a system-wide URLRequestContext.

ios/web_view/internal/app/application_context.h

Index: ios/web_view/internal/app/application_context.h
diff --git a/ios/web_view/internal/app/application_context.h b/ios/web_view/internal/app/application_context.h
new file mode 100644
index 0000000000000000000000000000000000000000..33b4d39429b4824521cd153fc5da63bf8f67643e
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+++ b/ios/web_view/internal/app/application_context.h
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+// 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 IOS_WEB_VIEW_INTERNAL_APP_APPLICATION_CONTEXT_H_
+#define IOS_WEB_VIEW_INTERNAL_APP_APPLICATION_CONTEXT_H_
+
+#include <string>
+
+#include "base/macros.h"
+
+namespace net {
+class URLRequestContextGetter;
+}
+
+namespace net_log {
+class ChromeNetLog;
+}
+
+class PrefService;
+class WebViewIOThread;
+
+namespace ios_web_view {
+
+class ApplicationContext;
+
+// Gets the global application context. Cannot return null.
+ApplicationContext* GetApplicationContext();
+
+// Defines application level globals.
+class ApplicationContext {
+ public:
+  // Gets the preferences associated with this application.
+  virtual PrefService* GetLocalState() = 0;
+
+  // Gets the URL request context associated with this application.
+  virtual net::URLRequestContextGetter* GetSystemURLRequestContext() = 0;
+
+  // Gets the locale used by the application.
+  virtual const std::string& GetApplicationLocale() = 0;
+
+ protected:
+  ApplicationContext();
+  virtual ~ApplicationContext();
+
+  // Sets the global ApplicationContext instance.
+  static void SetApplicationContext(ApplicationContext* context);
+
+  // Gets the ChromeNetLog.
+  virtual net_log::ChromeNetLog* GetNetLog() = 0;
+
+  // Gets the WebViewIOThread.
+  virtual WebViewIOThread* GetWebViewIOThread() = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ApplicationContext);
+};
+
+}  // namespace ios_web_view
+
+#endif  // IOS_WEB_VIEW_INTERNAL_APP_APPLICATION_CONTEXT_H_