Create offline_url_utils

ios/chrome/browser/reading_list/offline_url_utils.h

+// Copyright 2016 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_CHROME_BROWSER_READING_LIST_OFFLINE_URL_UTILS_H_
+#define IOS_CHROME_BROWSER_READING_LIST_OFFLINE_URL_UTILS_H_
+
+#include <string>
+
+#include "base/files/file_path.h"
+#include "url/gurl.h"
+
+namespace reading_list {
+
+// The absolute path of the directory where offline URLs are saved.
+base::FilePath OfflineRootDirectoryPath(const base::FilePath& profile_path);

[gambard, 2016/11/16 12:44:20]

Add comments for the argument please.

[Olivier, 2016/11/16 13:36:27]

Done.

+
+// The absolute path of the directory where a specific URL is saved offline.
+// Contains the page and supporting files (images).
+base::FilePath OfflineURLDirectoryAbsolutePath(
+    const base::FilePath& profile_path,

[gambard, 2016/11/16 12:44:19]

Same

[Olivier, 2016/11/16 13:36:27]

Done.

+    const GURL& url);
+
+// The absolute path of the offline webpage for the URL. The file may not
+// exist.
+base::FilePath OfflinePageAbsolutePath(const base::FilePath& profile_path,

[gambard, 2016/11/16 12:44:20]

Same

[Olivier, 2016/11/16 13:36:27]

Done.

+                                       const GURL& url);
+
+// The relative path to the distilled page. The result is relative to

[gambard, 2016/11/16 12:44:19]

Please add a logical link between "distilled page" and |url|. What about:
// The relative path to the offline webpage for the URL.

You can also add "The file may not exist", as above.

[Olivier, 2016/11/16 13:36:27]

Done.

+// |OfflineRootDirectoryPath()|.
+base::FilePath OfflinePagePath(const GURL& url);
+
+// The name of the directory containing offline data for |url|.
+std::string OfflineURLDirectoryID(const GURL& url);
+
+// The distilled URL chrome://offline/... that will load the file at |path|.
+GURL DistilledURLForPath(const base::FilePath& path);
+
+// The file URL pointing to the local file to load whan displaying

[gambard, 2016/11/16 12:44:20]

s/whan/when/

[Olivier, 2016/11/16 13:36:27]

Done.

+// |distilled_url|. If |resources_root_url| is not nullptr, it is set to a file

[gambard, 2016/11/16 12:44:19]

Maybe add where we are displaying |distilled_url|? To whom?

[Olivier, 2016/11/16 13:36:27]

I don't think this utility function needs to know where it is displayed.

+// URL to the directory conatining all the resources needed by |distilled_url|.
+// |profile_path| is the path to the profile directory.
+GURL FileURLForDistilledURL(const GURL& distilled_url,
+                            const base::FilePath& profile_path,
+                            GURL* resources_root_url);
+
+}  // namespace reading_list
+
+#endif  // IOS_CHROME_BROWSER_READING_LIST_OFFLINE_URL_UTILS_H_