Move animation code to new ui/base/animation directory....

ui/base/animation/tween.cc

Index: ui/base/animation/tween.cc
===================================================================
--- ui/base/animation/tween.cc	(revision 0)
+++ ui/base/animation/tween.cc	(working copy)
@@ -1,8 +1,8 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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 "app/tween.h"
+#include "ui/base/animation/tween.h"
 
 #include <math.h>
 
@@ -13,6 +13,8 @@
 #include "base/logging.h"
 #include "gfx/rect.h"
 
+namespace ui {
+
 // static
 double Tween::CalculateValue(Tween::Type type, double state) {
   DCHECK_GE(state, 0);
@@ -80,3 +82,5 @@
                    ValueBetween(value, start_bounds.height(),
                                 target_bounds.height()));
 }
+
+}  // namespace ui