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

webkit/glue/webkit_glue.gypi

 # 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.
 
 {
   'variables': {
     'conditions': [
       ['inside_chromium_build==0', {
         'webkit_src_dir': '../../../../..',
       },{
@@ skipping 268 matching lines @@
         '../plugins/ppapi/ppb_layer_compositor_impl.cc',
         '../plugins/ppapi/ppb_layer_compositor_impl.h',
         '../plugins/ppapi/ppb_memory_impl.cc',
         '../plugins/ppapi/ppb_memory_impl.h',
         '../plugins/ppapi/ppb_opengles_impl.cc',
         '../plugins/ppapi/ppb_opengles_impl.h',
         '../plugins/ppapi/ppb_proxy_impl.cc',
         '../plugins/ppapi/ppb_proxy_impl.h',
         '../plugins/ppapi/ppb_scrollbar_impl.cc',
         '../plugins/ppapi/ppb_scrollbar_impl.h',
+        '../plugins/ppapi/ppb_scrollbar_group_impl.cc',
+        '../plugins/ppapi/ppb_scrollbar_group_impl.h',
         '../plugins/ppapi/ppb_surface_3d_impl.cc',
         '../plugins/ppapi/ppb_surface_3d_impl.h',
         '../plugins/ppapi/ppb_uma_private_impl.cc',
         '../plugins/ppapi/ppb_uma_private_impl.h',
         '../plugins/ppapi/ppb_url_loader_impl.cc',
         '../plugins/ppapi/ppb_url_loader_impl.h',
         '../plugins/ppapi/ppb_url_request_info_impl.cc',
         '../plugins/ppapi/ppb_url_request_info_impl.h',
         '../plugins/ppapi/ppb_url_response_info_impl.cc',
         '../plugins/ppapi/ppb_url_response_info_impl.h',
@@ skipping 246 matching lines @@
               },
               'includes': [ '../../build/grit_action.gypi' ],
             },
           ],
           'includes': [ '../../build/grit_target.gypi' ],
         },
       ],
     }],
   ],
 }