Add UMA histogram data representing the Synced Notifications feature.

chrome/browser/notifications/sync_notifier/chrome_notifier_delegate.cc

Index: chrome/browser/notifications/sync_notifier/chrome_notifier_delegate.cc
diff --git a/chrome/browser/notifications/sync_notifier/chrome_notifier_delegate.cc b/chrome/browser/notifications/sync_notifier/chrome_notifier_delegate.cc
index 96f74c9b1a56925e86ef2dbd2d5703a856edfd40..dc2dd179a922d7e869b5ca59c78d8e582d19dbbc 100644
--- a/chrome/browser/notifications/sync_notifier/chrome_notifier_delegate.cc
+++ b/chrome/browser/notifications/sync_notifier/chrome_notifier_delegate.cc
@@ -36,6 +36,14 @@ void ChromeNotifierDelegate::Click() {
   GURL destination = notification->GetDefaultDestinationUrl();
   NavigateToUrl(destination);
   chrome_notifier_->MarkNotificationAsRead(notification_id_);
+
+  // Record the action in UMA statistics.
+  StatsCollection::iterator iter = stats_.find(notification_id_);
+  if (iter == stats_.end())
+    return;
+  SyncedNotificationStats& notification_stat = iter->second;
+
+  notification_stat.CollectAction(SYNCED_NOTIFICATION_ACTION_CLICK);
 }
 
 // TODO(petewil) Add the ability to do URL actions also.
@@ -47,6 +55,14 @@ void ChromeNotifierDelegate::ButtonClick(int button_index) {
     NavigateToUrl(destination);
     chrome_notifier_->MarkNotificationAsRead(notification_id_);
   }
+
+  // Now record the UMA statistics for this action.
+  StatsCollection::iterator iter = stats_.find(notification_id_);
+  if (iter == stats_.end())
+    return;
+  SyncedNotificationStats& notification_stat = iter->second;
+
+  notification_stat.CollectAction(SYNCED_NOTIFICATION_ACTION_CLICK);
 }
 
 void ChromeNotifierDelegate::NavigateToUrl(const GURL& destination) const {
@@ -68,6 +84,17 @@ void ChromeNotifierDelegate::NavigateToUrl(const GURL& destination) const {
 void ChromeNotifierDelegate::Close(bool by_user) {
   if (by_user)
     chrome_notifier_->MarkNotificationAsRead(notification_id_);
+
+  StatsCollection::iterator iter = stats_.find(notification_id_);
+  if (iter == stats_.end())
+    return;
+  SyncedNotificationStats& notification_stat = iter->second;
+  notification_stat.CollectAction(by_user ?
+      SYNCED_NOTIFICATION_ACTION_CLOSE_BY_USER :
+      SYNCED_NOTIFICATION_ACTION_CLOSE_BY_SYSTEM);
+  notification_stat.RecordAggregateStats();
+  stats_.erase(notification_id_);
+
 }
 
 }  // namespace notifier