[Offline pages] Filter out pages cached by different tabs on tab helper

chrome/browser/android/offline_pages/offline_page_tab_helper.h

Index: chrome/browser/android/offline_pages/offline_page_tab_helper.h
diff --git a/chrome/browser/android/offline_pages/offline_page_tab_helper.h b/chrome/browser/android/offline_pages/offline_page_tab_helper.h
index 7e3d35d7f5fade672db93b1b387bbe9139d4e776..7129453e9ef5926a4988d2ede1c77f507e60b3ea 100644
--- a/chrome/browser/android/offline_pages/offline_page_tab_helper.h
+++ b/chrome/browser/android/offline_pages/offline_page_tab_helper.h
@@ -55,6 +55,12 @@ class OfflinePageTabHelper :
                             const GURL& from_url,
                             const OfflinePageItem* offline_page);
 
+  void GetBestPageAndTryRedirect(const GURL& online_url,

[Dmitry Titov, 2016/06/27 22:06:04]

These two named almost the same. Consider renaming a bit, to make it clearer
(only say what they actually do):
GetBastPageAndTryRedirect -> StartRedirectToOfflinePage
SelectBestPageAndTryRedirect -> SelectBestPageToRedirect

[fgorski, 2016/06/27 22:40:09]

Done.

+                                 RedirectReason reason);
+  void SelectBestPageAndTryRedirect(RedirectReason reason,
+                                    const GURL& online_url,
+                                    const MultipleOfflinePageItemResult& pages);
+
   void Redirect(const GURL& from_url, const GURL& to_url);
 
   // Iff the tab we are associated with is redirected to an offline page,