Pepper and WebKit API change to support a plugin knowing if a scrollbar is an overlay one.

ppapi/shared_impl/resource_object_base.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 PPAPI_SHARED_IMPL_RESOURCE_OBJECT_BASE_H_
 #define PPAPI_SHARED_IMPL_RESOURCE_OBJECT_BASE_H_
 
 #include <stddef.h>  // For NULL.
 
 #define FOR_ALL_PPAPI_RESOURCE_APIS(F) \
@@ skipping 14 matching lines @@
   F(PPB_Flash_NetConnector_API) \
   F(PPB_Flash_TCPSocket_API) \
   F(PPB_Font_API) \
   F(PPB_Graphics2D_API) \
   F(PPB_Graphics3D_API) \
   F(PPB_ImageData_API) \
   F(PPB_InputEvent_API) \
   F(PPB_LayerCompositor_API) \
   F(PPB_PDFFont_API) \
   F(PPB_Scrollbar_API) \
+  F(PPB_ScrollbarGroup_API) \
   F(PPB_Surface3D_API) \
   F(PPB_Transport_API) \
   F(PPB_URLLoader_API) \
   F(PPB_URLRequestInfo_API) \
   F(PPB_URLResponseInfo_API) \
   F(PPB_VideoCapture_API) \
   F(PPB_VideoDecoder_API) \
   F(PPB_VideoLayer_API) \
   F(PPB_Widget_API)
 
@@ skipping 28 matching lines @@
 #define DEFINE_RESOURCE_CAST(RESOURCE) \
   template<> inline thunk::RESOURCE* ResourceObjectBase::GetAs() { \
     return As##RESOURCE(); \
   }
 FOR_ALL_PPAPI_RESOURCE_APIS(DEFINE_RESOURCE_CAST)
 #undef DEFINE_RESOURCE_CAST
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_RESOURCE_OBJECT_BASE_H_