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

chrome/browser/gtk/download_item_gtk.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/gtk/download_item_gtk.h"
 
 #include "app/gtk_util.h"
 #include "app/l10n_util.h"
 #include "app/menus/simple_menu_model.h"
 #include "app/resource_bundle.h"
@@ skipping 343 matching lines @@
         parent_shelf_->RemoveDownloadItem(this);  // This will delete us!
         return;
       }
       StopDownloadProgress();
 
       // Set up the widget as a drag source.
       DownloadItemDrag::SetSource(body_.get(), get_download(), icon_large_);
 
       complete_animation_.reset(new SlideAnimation(this));
       complete_animation_->SetSlideDuration(kCompleteAnimationDurationMs);
-      complete_animation_->SetTweenType(SlideAnimation::NONE);
+      complete_animation_->SetTweenType(Tween::LINEAR);
       complete_animation_->Show();
       break;
     case DownloadItem::IN_PROGRESS:
       get_download()->is_paused() ?
           StopDownloadProgress() : StartDownloadProgress();
       break;
     default:
       NOTREACHED();
   }
 
@@ skipping 419 matching lines @@
     download_util::OpenDownload(download);
   }
 }
 
 // static
 gboolean DownloadItemGtk::OnProgressAreaExpose(GtkWidget* widget,
     GdkEventExpose* event, DownloadItemGtk* download_item) {
   // Create a transparent canvas.
   gfx::CanvasPaint canvas(event, false);
   if (download_item->complete_animation_.get()) {
-    if (download_item->complete_animation_->IsAnimating()) {
+    if (download_item->complete_animation_->is_animating()) {
       download_util::PaintDownloadComplete(&canvas,
           widget->allocation.x, widget->allocation.y,
           download_item->complete_animation_->GetCurrentValue(),
           download_util::SMALL);
     }
   } else if (download_item->get_download()->state() !=
              DownloadItem::CANCELLED) {
     download_util::PaintDownloadProgress(&canvas,
         widget->allocation.x, widget->allocation.y,
         download_item->progress_angle_,
@@ skipping 12 matching lines @@
 
   return TRUE;
 }
 
 // static
 gboolean DownloadItemGtk::OnMenuButtonPressEvent(GtkWidget* button,
                                                  GdkEvent* event,
                                                  DownloadItemGtk* item) {
   // Stop any completion animation.
   if (item->complete_animation_.get() &&
-      item->complete_animation_->IsAnimating()) {
+      item->complete_animation_->is_animating()) {
     item->complete_animation_->End();
   }
 
   if (event->type == GDK_BUTTON_PRESS) {
     GdkEventButton* event_button = reinterpret_cast<GdkEventButton*>(event);
     if (event_button->button == 1) {
       if (item->menu_.get() == NULL) {
         item->menu_.reset(new DownloadShelfContextMenuGtk(
                           item->download_model_.get(), item));
       }
@@ skipping 27 matching lines @@
 
 // static
 void DownloadItemGtk::OnDangerousDecline(GtkWidget* button,
                                          DownloadItemGtk* item) {
   UMA_HISTOGRAM_LONG_TIMES("clickjacking.discard_download",
                            base::Time::Now() - item->creation_time_);
   if (item->get_download()->state() == DownloadItem::IN_PROGRESS)
     item->get_download()->Cancel(true);
   item->get_download()->Remove(true);
 }