Don't try to animate the balloon before it's been shown, it will cause a cras...

chrome/browser/notifications/balloon_collection.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/notifications/balloon_collection_impl.h"
 
 #include "base/logging.h"
 #include "base/stl_util-inl.h"
 #include "chrome/browser/notifications/balloon.h"
 #include "chrome/browser/notifications/notification.h"
@@ skipping 24 matching lines @@
 }
 
 BalloonCollectionImpl::~BalloonCollectionImpl() {
   STLDeleteElements(&balloons_);
 }
 
 void BalloonCollectionImpl::Add(const Notification& notification,
                                 Profile* profile) {
   Balloon* new_balloon = MakeBalloon(notification, profile);
 
-  new_balloon->SetPosition(layout_.OffScreenLocation(), true);
+  new_balloon->SetPosition(layout_.OffScreenLocation(), false);
   new_balloon->Show();
   balloons_.push_back(new_balloon);
   PositionBalloons(false);
 
   // There may be no listener in a unit test.
   if (space_change_listener_)
     space_change_listener_->OnBalloonSpaceChanged();
 }
 
 bool BalloonCollectionImpl::Remove(const Notification& notification) {
@@ skipping 166 matching lines @@
   gfx::Rect new_work_area = info_provider->GetPrimaryMonitorWorkArea();
 #endif
   if (!work_area_.Equals(new_work_area)) {
     work_area_.SetRect(new_work_area.x(), new_work_area.y(),
                        new_work_area.width(), new_work_area.height());
     changed = true;
   }
 
   return changed;
 }