Limit number of notifications that can be received by the client.

chrome/browser/extensions/app_notification.h

Index: chrome/browser/extensions/app_notification.h
===================================================================
--- chrome/browser/extensions/app_notification.h	(revision 109957)
+++ chrome/browser/extensions/app_notification.h	(working copy)
@@ -9,6 +9,7 @@
 #include <string>
 #include <vector>
 
+#include "base/time.h"
 #include "base/memory/linked_ptr.h"
 #include "base/values.h"
 #include "googleurl/src/gurl.h"
@@ -21,6 +22,7 @@
   // If |is_local| is true, notification is not synced.
   // If |guid| is empty, a new guid is automatically created.
   AppNotification(bool is_local,
+                  const base::Time& creation_time,
                   const std::string& guid,
                   const std::string& extension_id,
                   const std::string& title,
@@ -34,9 +36,13 @@
   // Setters for optional properties.
   void set_link_url(const GURL& url) { link_url_ = url; }
   void set_link_text(const std::string& text) { link_text_ = text; }
+  void set_creation_time(const base::Time& creation_time) {
+    creation_time_ = creation_time;
+  }
 
   // Accessors.
   bool is_local() const { return is_local_; }
+  const base::Time creation_time() const { return creation_time_; }
   const std::string& guid() const { return guid_; }
   const std::string& extension_id() const { return extension_id_; }
   const std::string& title() const { return title_; }
@@ -59,6 +65,7 @@
   // Whether notification is local only, which means it is not synced
   // across machines.
   bool is_local_;
+  base::Time creation_time_;
   std::string guid_;
   std::string extension_id_;
   std::string title_;