Re-add snap-back behavior (Chrome side)

content/renderer/renderer_webkitplatformsupport_impl.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 CONTENT_RENDERER_RENDERER_WEBKITPLATFORMSUPPORT_IMPL_H_
 #define CONTENT_RENDERER_RENDERER_WEBKITPLATFORMSUPPORT_IMPL_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/platform_file.h"
@@ skipping 75 matching lines @@
   virtual long long databaseGetSpaceAvailableForOrigin(
       const blink::WebString& origin_identifier);
   virtual blink::WebString signedPublicKeyAndChallengeString(
       unsigned key_size_index,
       const blink::WebString& challenge,
       const blink::WebURL& url);
   virtual void getPluginList(bool refresh,
                              blink::WebPluginListBuilder* builder);
   virtual blink::WebPublicSuffixList* publicSuffixList();
   virtual void screenColorProfile(blink::WebVector<char>* to_profile);
+  virtual blink::WebScrollbarBehavior* scrollbarBehavior();
   virtual blink::WebIDBFactory* idbFactory();
   virtual blink::WebFileSystem* fileSystem();
   virtual bool canAccelerate2dCanvas();
   virtual bool isThreadedCompositingEnabled();
   virtual double audioHardwareSampleRate();
   virtual size_t audioHardwareBufferSize();
   virtual unsigned audioHardwareOutputChannels();
   virtual blink::WebDatabaseObserver* databaseObserver();
 
   // TODO(crogers): remove deprecated API as soon as WebKit calls new API.
@@ skipping 118 matching lines @@
   scoped_refptr<QuotaMessageFilter> quota_message_filter_;
 
   scoped_ptr<WebDatabaseObserverImpl> web_database_observer_impl_;
 
   webkit::WebCompositorSupportImpl compositor_support_;
 
   scoped_ptr<WebCryptoImpl> web_crypto_;
 
   scoped_ptr<ScreenOrientationDispatcher> screen_orientation_dispatcher_;
 
+  scoped_ptr<blink::WebScrollbarBehavior> web_scrollbar_behavior_;
+
   DISALLOW_COPY_AND_ASSIGN(RendererWebKitPlatformSupportImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDERER_WEBKITPLATFORMSUPPORT_IMPL_H_