Refactors animation to allow for cleaner subclassing. I'm doing this

chrome/browser/chromeos/panels/panel_scroller.cc

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.  Use of this
+// 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/chromeos/panels/panel_scroller.h"
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/stl_util-inl.h"
 #include "base/string_util.h"
 #include "gfx/canvas.h"
 #include "chrome/browser/chromeos/panels/panel_scroller_container.h"
 #include "chrome/browser/chromeos/panels/panel_scroller_header.h"
 #include "views/widget/widget_gtk.h"
 
 struct PanelScroller::Panel {
   PanelScrollerHeader* header;
   PanelScrollerContainer* container;
 };
 
 PanelScroller::PanelScroller()
     : views::View(),
       divider_height_(18),
       needs_layout_(true),
       scroll_pos_(0),
       ALLOW_THIS_IN_INITIALIZER_LIST(animation_(this)),
       animated_scroll_begin_(0),
       animated_scroll_end_(0) {
-  animation_.SetTweenType(SlideAnimation::EASE_IN_OUT);
+  animation_.SetTweenType(Tween::EASE_IN_OUT);
   animation_.SetSlideDuration(300);
 
   Panel* panel = new Panel;
   panel->header = new PanelScrollerHeader(this);
   panel->header->set_title(ASCIIToUTF16("Email"));
   panel->container = new PanelScrollerContainer(this, new views::View());
   panels_.push_back(panel);
 
   panel = new Panel;
   panel->header = new PanelScrollerHeader(this);
@@ skipping 190 matching lines @@
 
   animated_scroll_begin_ = scroll_pos_;
   if (animated_scroll_begin_ == animated_scroll_end_)
     return;  // Nothing to animate.
 
   // Start animating to the destination.
   animation_.Reset();
   animation_.Show();
 }
 
-void PanelScroller::AnimationEnded(const Animation* animation) {
-}
-
 void PanelScroller::AnimationProgressed(const Animation* animation) {
   scroll_pos_ = static_cast<int>(
       static_cast<double>(animated_scroll_end_ - animated_scroll_begin_) *
       animation_.GetCurrentValue()) + animated_scroll_begin_;
 
   Layout();
   SchedulePaint();
 }
-
-void PanelScroller::AnimationCanceled(const Animation* animation) {
-}