Call on_collection_changed_callback_ on chromeos

BUG=81624,chromium-os:15176
TEST=pyauto notification will pass

Review URL: http://codereview.chromium.org/7146027

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@89368 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/chromeos/notifications/balloon_collection_impl.cc

@@ -47,6 +47,10 @@ void BalloonCollectionImpl::Add(const Notification& notification,
   // There may be no listener in a unit test.
   if (space_change_listener_)
     space_change_listener_->OnBalloonSpaceChanged();
+
+  // This is used only for testing.
+  if (on_collection_changed_callback_.get())
+    on_collection_changed_callback_->Run();
 }
 
 bool BalloonCollectionImpl::AddWebUIMessageCallback(
@@ -131,6 +135,10 @@ void BalloonCollectionImpl::OnBalloonClosed(Balloon* source) {
   // There may be no listener in a unit test.
   if (space_change_listener_)
     space_change_listener_->OnBalloonSpaceChanged();
+
+  // This is used only for testing.
+  if (on_collection_changed_callback_.get())
+    on_collection_changed_callback_->Run();
 }
 
 const BalloonCollectionImpl::Balloons&