Introduce TranslateService and TranslateDownloadManager

components/translate/core/browser/translate_download_manager.h

+// 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 COMPONENTS_TRANSLATE_CORE_BROWER_TRANSLATE_DOWNLOAD_MANAGER_H_
+#define COMPONENTS_TRANSLATE_CORE_BROWER_TRANSLATE_DOWNLOAD_MANAGER_H_
+
+#include <string>
+
+#include "base/logging.h"
+#include "base/memory/ref_counted.h"
+#include "net/url_request/url_request_context_getter.h"
+
+template <typename T> struct DefaultSingletonTraits;
+
+// Manages the downloaded resources for Translate, such as the translate script
+// and the language list.
+// TODO(droger): TranslateDownloadManager should own TranslateLanguageList and
+// TranslateScript. See http://crbug.com/335074 and http://crbug.com/335077.
+class TranslateDownloadManager {
+ public:
+  // Returns the singleton instance.
+  static TranslateDownloadManager* GetInstance();
+
+  // The request context used to download the resources.
+  // Should be set before this class can be used.
+  net::URLRequestContextGetter* request_context() { return request_context_; }
+  void set_request_context(net::URLRequestContextGetter* context) {
+      request_context_ = context;
+  }
+
+  // The application locale.
+  // Should be set before this class can be used.
+  const std::string& application_locale() {
+    DCHECK(!application_locale_.empty());
+    return application_locale_;
+  }
+  void set_application_locale(const std::string& locale) {
+    application_locale_ = locale;
+  }
+
+ private:
+  friend struct DefaultSingletonTraits<TranslateDownloadManager>;
+  TranslateDownloadManager();
+  virtual ~TranslateDownloadManager();
+
+  std::string application_locale_;
+  scoped_refptr<net::URLRequestContextGetter> request_context_;
+};
+
+#endif  // COMPONENTS_TRANSLATE_CORE_BROWER_TRANSLATE_DOWNLOAD_MANAGER_H_