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

chrome/browser/views/download_started_animation_win.cc

 // Copyright (c) 2009 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/download/download_started_animation.h"
 
-#include "app/animation.h"
+#include "app/linear_animation.h"
 #include "app/resource_bundle.h"
 #include "chrome/browser/tab_contents/tab_contents.h"
 #include "chrome/common/notification_registrar.h"
 #include "chrome/common/notification_service.h"
 #include "gfx/rect.h"
 #include "grit/theme_resources.h"
 #include "views/controls/image_view.h"
 #include "views/widget/widget_win.h"
 
 // How long to spend moving downwards and fading out after waiting.
 static const int kMoveTimeMs = 600;
 
 // The animation framerate.
 static const int kFrameRateHz = 60;
 
 // What fraction of the frame height to move downward from the frame center.
 // Note that setting this greater than 0.5 will mean moving past the bottom of
 // the frame.
 static const double kMoveFraction = 1.0 / 3.0;
 
 namespace {
 
 // DownloadStartAnimation creates an animation (which begins running
 // immediately) that animates an image downward from the center of the frame
 // provided on the constructor, while simultaneously fading it out.  To use,
 // simply call "new DownloadStartAnimation"; the class cleans itself up when it
 // finishes animating.
-class DownloadStartedAnimationWin : public Animation,
+class DownloadStartedAnimationWin : public LinearAnimation,
                                     public NotificationObserver,
                                     public views::ImageView {
  public:
   explicit DownloadStartedAnimationWin(TabContents* tab_contents);
 
  private:
   // Move the animation to wherever it should currently be.
   void Reposition();
 
   // Shut down the animation cleanly.
@@ skipping 21 matching lines @@
   gfx::Rect tab_contents_bounds_;
 
   // A scoped container for notification registries.
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadStartedAnimationWin);
 };
 
 DownloadStartedAnimationWin::DownloadStartedAnimationWin(
     TabContents* tab_contents)
-    : Animation(kMoveTimeMs, kFrameRateHz, NULL),
+    : LinearAnimation(kMoveTimeMs, kFrameRateHz, NULL),
       popup_(NULL),
       tab_contents_(tab_contents) {
   static SkBitmap* kDownloadImage = NULL;
   if (!kDownloadImage) {
     kDownloadImage = ResourceBundle::GetSharedInstance().GetBitmapNamed(
         IDR_DOWNLOAD_ANIMATION_BEGIN);
   }
 
   // If we're too small to show the download image, then don't bother -
   // the shelf will be enough.
@@ skipping 83 matching lines @@
 }
 
 }  // namespace
 
 // static
 void DownloadStartedAnimation::Show(TabContents* tab_contents) {
   // The animation will delete itself when it's finished or when the tab
   // contents is hidden or destroyed.
   new DownloadStartedAnimationWin(tab_contents);
 }