Implement features in NativeViewHostAura for scroll end effect

ui/views/controls/native/native_view_host_wrapper.h

 // Copyright (c) 2011 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_NATIVE_NATIVE_VIEW_HOST_WRAPPER_H_
 #define UI_VIEWS_CONTROLS_NATIVE_NATIVE_VIEW_HOST_WRAPPER_H_
 
 #include "ui/gfx/native_widget_types.h"
 #include "ui/views/views_export.h"
 
 namespace views {
 
 class NativeViewHost;
 
 // An interface that implemented by an object that wraps a gfx::NativeView on
 // a specific platform, used to perform platform specific operations on that
 // native view when attached, detached, moved and sized.
 class VIEWS_EXPORT NativeViewHostWrapper {
  public:
   virtual ~NativeViewHostWrapper() {}
 
   // Called right before a gfx::NativeView is attached to the associated
   // NativeViewHost, allowing the wrapper to perform platform-specific
   // initialization.
   virtual void NativeViewWillAttach() = 0;
 
+  // Called at the end of attaching a gfx::NativeView to the associated
+  // NativeViewHost, allowing the wrapper to perform platform-specific
+  // operations that need to occur after the gfx::NativeView is attached.
+  virtual void NativeViewAttached() = 0;
+
   // Called before the attached gfx::NativeView is detached from the
   // NativeViewHost, allowing the wrapper to perform platform-specific
   // cleanup. |destroyed| is true if the native view is detached
   // because it's being destroyed, or false otherwise.
   virtual void NativeViewDetaching(bool destroyed) = 0;
 
   // Called when our associated NativeViewHost is added to a View hierarchy
   // rooted at a valid Widget.
   virtual void AddedToWidget() = 0;
 
@@ skipping 26 matching lines @@
   virtual gfx::NativeViewAccessible GetNativeViewAccessible() = 0;
 
   // Creates a platform-specific instance of an object implementing this
   // interface.
   static NativeViewHostWrapper* CreateWrapper(NativeViewHost* host);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_NATIVE_NATIVE_VIEW_HOST_WRAPPER_H_