Add 3-stage animation for minimization of Panels on Win.

chrome/browser/ui/panels/panel_browser_view.h

Index: chrome/browser/ui/panels/panel_browser_view.h
diff --git a/chrome/browser/ui/panels/panel_browser_view.h b/chrome/browser/ui/panels/panel_browser_view.h
index 9873ed2aaaf418b4908de284b76718ba9d597167..ce4cfaf79936d28a40c6e7261490db464cd4b926 100644
--- a/chrome/browser/ui/panels/panel_browser_view.h
+++ b/chrome/browser/ui/panels/panel_browser_view.h
@@ -17,9 +17,7 @@ class Browser;
 class Panel;
 class NativePanelTestingWin;
 class PanelBrowserFrameView;
-namespace ui {
-class SlideAnimation;
-}
+class CustomSlideAnimation;
 
 // A browser view that implements Panel specific behavior.
 class PanelBrowserView : public BrowserView,
@@ -146,7 +144,7 @@ class PanelBrowserView : public BrowserView,
   MouseDraggingState mouse_dragging_state_;
 
   // Used to animate the bounds change.
-  scoped_ptr<ui::SlideAnimation> bounds_animator_;
+  scoped_ptr<CustomSlideAnimation> bounds_animator_;
   gfx::Rect animation_start_bounds_;
 
   // Is the panel in highlighted state to draw people's attention?