Implementation of renotify flag for Notifications.

content/browser/notifications/notification_database_data.proto

Index: content/browser/notifications/notification_database_data.proto
diff --git a/content/browser/notifications/notification_database_data.proto b/content/browser/notifications/notification_database_data.proto
index 17620782d9d596c20b85a8b751e8d880f52061ce..af6a5b84821f234c7d97e611d507eeff72f4dc76 100644
--- a/content/browser/notifications/notification_database_data.proto
+++ b/content/browser/notifications/notification_database_data.proto
@@ -29,7 +29,7 @@ message NotificationDatabaseDataProto {
   // Actual data payload of the notification. This message is the protocol
   // buffer meant to serialize the content::PlatformNotificationData structure.
   //
-  // Next tag: 13
+  // Next tag: 14
   message NotificationData {
     enum Direction {
       LEFT_TO_RIGHT = 0;
@@ -45,6 +45,7 @@ message NotificationDatabaseDataProto {
     optional string icon = 6;
     repeated int32 vibration_pattern = 9 [packed=true];
     optional int64 timestamp = 12;
+    optional bool renotify = 13;
     optional bool silent = 7;
     optional bool require_interaction = 11;
     optional bytes data = 8;