Implement features in NativeViewHostAura for scroll end effect

ui/views/controls/webview/webview.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_WEBVIEW_WEBVIEW_H_
 #define UI_VIEWS_CONTROLS_WEBVIEW_WEBVIEW_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_contents_delegate.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "ui/views/accessibility/native_view_accessibility.h"
+#include "ui/views/controls/native/native_view_host.h"
 #include "ui/views/controls/webview/webview_export.h"
 #include "ui/views/view.h"
 
 namespace content {
 class SiteInstance;
 }
 
 namespace views {
 
-class NativeViewHost;
-
 class WEBVIEW_EXPORT WebView : public View,
                                public content::NotificationObserver,
                                public content::WebContentsDelegate,
                                public content::WebContentsObserver {
  public:
   static const char kViewClassName[];
 
   explicit WebView(content::BrowserContext* browser_context);
   virtual ~WebView();
 
@@ skipping 28 matching lines @@
 
   // Controls how the attached WebContents is resized.
   // false = WebContents' views' bounds are updated continuously as the
   //         WebView's bounds change (default).
   // true  = WebContents' views' position is updated continuously but its size
   //         is not (which may result in some clipping or under-painting) until
   //         a continuous size operation completes. This allows for smoother
   //         resizing performance during interactive resizes and animations.
   void SetFastResize(bool fast_resize);
 
+  // Controls how the clip is positioned relative to the contents when using
+  // fast resize. Details of the meaning of the parameter can be found in
+  // native_view_host.h
+  void SetFastResizeGravity(NativeViewHost::Gravity gravity);
+
   // Called when the WebContents is focused.
   // TODO(beng): This view should become a WebContentsViewObserver when a
   //             WebContents is attached, and not rely on the delegate to
   //             forward this notification.
   void OnWebContentsFocused(content::WebContents* web_contents);
 
   // When used to host UI, we need to explicitly allow accelerators to be
   // processed. Default is false.
   void set_allow_accelerators(bool allow_accelerators) {
     allow_accelerators_ = allow_accelerators;
@@ skipping 60 matching lines @@
   content::NotificationRegistrar registrar_;
   bool allow_accelerators_;
   gfx::Size preferred_size_;
 
   DISALLOW_COPY_AND_ASSIGN(WebView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_WEBVIEW_WEBVIEW_H_