Add finch flag for rendering a recently closed link on the local ntp.

chrome/browser/search/search.h

Index: chrome/browser/search/search.h
diff --git a/chrome/browser/search/search.h b/chrome/browser/search/search.h
index 62fa23181974688f04ac31b5862cb43e852a1f85..3f4a9d1de81535917e118c3850203388c00388db 100644
--- a/chrome/browser/search/search.h
+++ b/chrome/browser/search/search.h
@@ -141,6 +141,10 @@ bool IsInstantEnabled(Profile* profile);
 // to always show the remote NTP on browser startup.
 bool ShouldPreferRemoteNTPOnStartup();
 
+// Returns true if the recent tabs link should be shown on the local NTP in
+// field trials.
+bool ShouldShowRecentTabsOnNTP();
+
 // Returns true if |my_url| matches |other_url|.
 bool MatchesOriginAndPath(const GURL& my_url, const GURL& other_url);