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

chrome/browser/views/tabs/side_tab.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/views/tabs/side_tab.h"
 
 #include "app/resource_bundle.h"
 #include "app/theme_provider.h"
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
@@ skipping 147 matching lines @@
   canvas->DrawStringInt(UTF16ToWideHack(model_->GetTitle(this)), *font_,
                         SK_ColorBLACK, title_bounds_.x(), title_bounds_.y(),
                         title_bounds_.width(), title_bounds_.height());
 
   if (!model_->IsSelected(this) &&
       GetThemeProvider()->ShouldUseNativeFrame()) {
     // Make sure un-selected tabs are somewhat transparent.
     SkPaint paint;
 
     SkAlpha opacity = kBackgroundTabAlpha;
-    if (hover_animation_->IsAnimating())
+    if (hover_animation_->is_animating())
       opacity = static_cast<SkAlpha>(hover_animation_->GetCurrentValue() * 255);
 
     paint.setColor(SkColorSetARGB(kBackgroundTabAlpha, 255, 255, 255));
     paint.setXfermodeMode(SkXfermode::kDstIn_Mode);
     paint.setStyle(SkPaint::kFill_Style);
     paint.setAntiAlias(true);
     canvas->FillRectInt(0, 0, width(), height(), paint);
   }
 }
 
 gfx::Size SideTab::GetPreferredSize() {
   return gfx::Size(0, 27);
 }
 
 void SideTab::OnMouseEntered(const views::MouseEvent& event) {
-  hover_animation_->SetTweenType(SlideAnimation::EASE_OUT);
+  hover_animation_->SetTweenType(Tween::EASE_OUT);
   hover_animation_->Show();
 }
 
 void SideTab::OnMouseExited(const views::MouseEvent& event) {
-  hover_animation_->SetTweenType(SlideAnimation::EASE_IN);
+  hover_animation_->SetTweenType(Tween::EASE_IN);
   hover_animation_->Hide();
 }
 
 bool SideTab::OnMousePressed(const views::MouseEvent& event) {
   if (event.IsOnlyLeftMouseButton())
     model_->SelectTab(this);
   return true;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ skipping 67 matching lines @@
     waiting_animation_frame_count =
         waiting_animation_frames->width() / waiting_animation_frames->height();
 
     waiting_to_loading_frame_count_ratio =
         waiting_animation_frame_count / loading_animation_frame_count;
 
     initialized = true;
   }
 }