Last_n: do not save snapshot of custom tabs.

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 <stdint.h>
 
 #include "base/callback.h"
@@ skipping 50 matching lines @@
 
   // Returns true if download button is shown in the error page.
   static bool IsShowingDownloadButtonInErrorPage(
       content::WebContents* web_contents);
 
   // Gets an Android Tab ID from a tab containing |web_contents|. Returns false,
   // when tab is not available. Returns true otherwise and sets |tab_id| to the
   // ID of the tab.
   static bool GetTabId(content::WebContents* web_contents, int* tab_id);
 
+  // Returns true if the |web_contents| is currently being presented inside a
+  // custom tab.
+  static bool CurrentlyShownInCustomTab(content::WebContents* web_contents);
+
   // Performs a check, whether pages with specified |url| and |name_space|
   // already exist. Result is returned in a |callback|, where first parameter
   // indicates whether offline pages exist, while second is a helper value to
   // report UMA, indicating the time the latest existing page with such
   // parameters was saved.
   static void CheckExistenceOfPagesWithURL(
       content::BrowserContext* browser_context,
       const std::string name_space,
       const GURL& url,
       const PagesExistCallback& callback);
@@ skipping 15 matching lines @@
                                        const GURL& url);
 
   // Returns original URL of the given web contents. Empty URL is returned if
   // no redirect occurred.
   static GURL GetOriginalURLFromWebContents(content::WebContents* web_contents);
 };
 
 }  // namespace offline_pages
 
 #endif  // CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_UTILS_H_