V2: Implement reparenting, bounds and visibility change notifications, and write more tests.

ui/v2/public/view_observer.h

 // Copyright (c) 2013 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_V2_PUBLIC_VIEW_OBSERVER_H_
 #define UI_V2_PUBLIC_VIEW_OBSERVER_H_
 
 #include "ui/v2/public/v2_export.h"
 
 namespace gfx {
@@ skipping 34 matching lines @@
   // 3. |target|'s parent hierarchy in its |new_parent|.
   //        (only for Changed notifications).
   // This sequence is performed via the OnTreeChange notification below before
   // and after the change is committed.
   virtual void OnViewTreeChange(const TreeChangeParams& params) {}
 
   // TODO(beng): stacking change notification?
 
   // Disposition.
 
-  virtual void OnViewDestroying() {}
-  virtual void OnViewDestroyed() {}
+  virtual void OnViewDestroy(View* view, DispositionChangePhase phase) {}
 
-  virtual void OnViewBoundsChanged(const gfx::Rect& old_bounds,
+  virtual void OnViewBoundsChanged(View* view,
+                                   const gfx::Rect& old_bounds,
                                    const gfx::Rect& new_bounds) {}
 
-  virtual void OnViewVisibilityChanging() {}
-  virtual void OnViewVisibilityChanged() {}
+  virtual void OnViewVisibilityChange(View* view,
+                                      DispositionChangePhase phase) {}
 
  protected:
   virtual ~ViewObserver() {}
 };
 
 }  // namespace v2
 
 #endif  // UI_V2_PUBLIC_VIEW_OBSERVER_H_