Allow message center and related bubbles to render on Windows.

ui/views/controls/slide_out_view.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_VIEWS_CONTROLS_SLIDE_OUT_VIEW_H_
 #define UI_VIEWS_CONTROLS_SLIDE_OUT_VIEW_H_
 
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/views/view.h"
 #include "ui/views/views_export.h"
 
 namespace views {
 
 // A View that can be closed by a slide-out touch gesture.
 class VIEWS_EXPORT SlideOutView : public views::View,
                                   public ui::ImplicitAnimationObserver {
  public:
+  enum SlideDirection {
+    SLIDE_LEFT,
+    SLIDE_RIGHT

[msw, 2013/01/17 02:28:30]

nit: use a comma after trailing enum entries.

[dewittj, 2013/01/17 21:25:18]

Done.

+  };
+
+  class Impl {

[msw, 2013/01/17 02:28:30]

nit: comment.

[dewittj, 2013/01/17 21:25:18]

Gone.

+   public:
+    virtual void TransformView(float scroll_amount) = 0;
+    virtual void RestoreView() = 0;
+    virtual void HideView(SlideDirection direction) = 0;
+    virtual ~Impl() {}

[msw, 2013/01/17 02:28:30]

nit: list the destructor above other functions.

[dewittj, 2013/01/17 21:25:18]

Gone.

+  };
+
   SlideOutView();
   virtual ~SlideOutView();
 
  protected:
   // Called when user intends to close the View by sliding it out.
   virtual void OnSlideOut() = 0;
 
   // Overridden from views::View.
   virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
 
- private:
-  enum SlideDirection {
-    SLIDE_LEFT,
-    SLIDE_RIGHT
-  };
-
   // Restores the transform and opacity of the view.
   void RestoreVisualState();
 
   // Slides the view out and closes it after the animation.
   void SlideOutAndClose(SlideDirection direction);
 
   // Overridden from ImplicitAnimationObserver.
   virtual void OnImplicitAnimationsCompleted() OVERRIDE;
 
+  scoped_ptr<Impl> impl_;
   float gesture_scroll_amount_;
 
   DISALLOW_COPY_AND_ASSIGN(SlideOutView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_SLIDE_OUT_VIEW_H_