Enable deep-linking from notifications for recently used web apps on the Android home screen.

chrome/browser/android/shortcut_info.h

Index: chrome/browser/android/shortcut_info.h
diff --git a/chrome/browser/android/shortcut_info.h b/chrome/browser/android/shortcut_info.h
index fe1612c13918efbefe4568bc12a996d8f796f591..ea6e33fabd86913f3bbd9abdaad3b89f06619582 100644
--- a/chrome/browser/android/shortcut_info.h
+++ b/chrome/browser/android/shortcut_info.h
@@ -26,7 +26,8 @@ struct ShortcutInfo {
     SOURCE_APP_BANNER = 2,
     SOURCE_BOOKMARK_NAVIGATOR_WIDGET = 3,
     SOURCE_BOOKMARK_SHORTCUT_WIDGET = 4,
-    SOURCE_COUNT = 5
+    SOURCE_NOTIFICATION = 5,
+    SOURCE_COUNT = 6
   };
 
   explicit ShortcutInfo(const GURL& shortcut_url);