Makes notifications animate from the bottom of the screen (as was

chrome/browser/notifications/balloon.cc

 // Copyright (c) 2012 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.h"
 
 #include "base/logging.h"
 #include "chrome/browser/notifications/balloon_collection.h"
 #include "chrome/browser/notifications/notification.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 
+#if !defined(OS_WIN) && !defined(USE_AURA)
+// static
+int BalloonView::GetHorizontalMargin() {
+  // TODO: implement for linux (non-aura) and mac.
+  return 0;
+}
+#endif
+
 Balloon::Balloon(const Notification& notification, Profile* profile,
                  BalloonCollection* collection)
     : profile_(profile),
       notification_(new Notification(notification)),
       collection_(collection) {
 }
 
 Balloon::~Balloon() {
 }
 
@@ skipping 36 matching lines @@
   notification_->Close(by_user);
   collection_->OnBalloonClosed(this);
 }
 
 void Balloon::CloseByScript() {
   // A user-initiated close begins with the view and then closes this object;
   // we simulate that with a script-initiated close but pass |by_user|=false.
   DCHECK(balloon_view_.get());
   balloon_view_->Close(false);
 }