[Offline pages] Refactor URL conversions from TabAndroid

chrome/browser/android/offline_pages/offline_page_utils.h

+// Copyright 2015 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 CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_UTILS_H_
+#define CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_UTILS_H_
+
+#include "base/basictypes.h"
+
+class GURL;
+
+namespace content {
+class BrowserContext;
+}
+
+namespace offline_pages {
+struct OfflinePageItem;
+
+class OfflinePageUtils {
+ public:
+  // Returns true if |url| might point to an offline page.
+  static bool MightBeOfflineURL(const GURL& url);
+
+  // Gets an offline URL of an offline page with |online_url| if one exists.
+  static GURL GetOfflineURLForOnlineURL(
+      content::BrowserContext* browser_context,
+      const GURL& online_url);
+
+  // Gets an online URL of an offline page with |offline_url| if one exists.
+  static GURL GetOnlineURLForOfflineURL(
+      content::BrowserContext* browser_context,
+      const GURL& offline_url);
+
+  // Gets a bookmark ID related to the |offline_url|.
+  static int64 GetBookmarkIdForOfflineURL(
+      content::BrowserContext* browser_context,
+      const GURL& offline_url);
+
+  // Checks whether |offline_url| points to an offline page.
+  static bool IsOfflinePage(content::BrowserContext* browser_context,
+                            const GURL& offline_url);
+
+  // Checks whether offline page for |online_url| exists.
+  static bool HasOfflinePageForOnlineURL(
+      content::BrowserContext* browser_context,
+      const GURL& online_url);
+
+  // Checks whether any offline page is saved.
+  static const bool HasOfflinePages(content::BrowserContext* browser_context);
+};
+
+}  // namespace offline_pages
+
+#endif  // CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_UTILS_H_