Last_n: do not save snapshot of custom tabs.

chrome/browser/android/offline_pages/offline_page_utils.h

Index: chrome/browser/android/offline_pages/offline_page_utils.h
diff --git a/chrome/browser/android/offline_pages/offline_page_utils.h b/chrome/browser/android/offline_pages/offline_page_utils.h
index f2231957ff4e586567fd3d95dbdf2f5eeb0dc424..29ddbb863a92c9a4e81aa264a361d3b8f2c89fa8 100644
--- a/chrome/browser/android/offline_pages/offline_page_utils.h
+++ b/chrome/browser/android/offline_pages/offline_page_utils.h
@@ -68,6 +68,10 @@ class OfflinePageUtils {
   // 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 IsCurrentlyACustomTab(content::WebContents* web_contents);

[dewittj, 2017/03/27 20:37:45]

nit: a web contents isn't a custom tab, it is shown inside one. So, maybe
CurrentlyShownInCustomTab is better?

[gone, 2017/03/27 22:22:10]

+1

[carlosk, 2017/03/28 02:00:32]

Done.

+
   // 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