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

ppapi/proxy/resource_creation_proxy.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_PROXY_RESOURCE_CREATION_PROXY_H_
 #define PPAPI_PROXY_RESOURCE_CREATION_PROXY_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 81 matching lines @@
       uint32_t key_code,
       PP_Var character_text) OVERRIDE;
   virtual PP_Resource CreateMouseInputEvent(
       PP_Instance instance,
       PP_InputEvent_Type type,
       PP_TimeTicks time_stamp,
       uint32_t modifiers,
       PP_InputEvent_MouseButton mouse_button,
       const PP_Point* mouse_position,
       int32_t click_count) OVERRIDE;
-  virtual PP_Resource CreateScrollbar(PP_Instance instance,
+  virtual PP_Resource CreateScrollbar(PP_Resource scrollbar_group,
                                       PP_Bool vertical) OVERRIDE;
+  virtual PP_Resource CreateScrollbarGroup(PP_Instance instance) OVERRIDE;
   virtual PP_Resource CreateSurface3D(PP_Instance instance,
                                       PP_Config3D_Dev config,
                                       const int32_t* attrib_list) OVERRIDE;
   virtual PP_Resource CreateTransport(PP_Instance instance,
                                       const char* name,
                                       const char* proto) OVERRIDE;
   virtual PP_Resource CreateURLLoader(PP_Instance instance) OVERRIDE;
   virtual PP_Resource CreateURLRequestInfo(PP_Instance instance) OVERRIDE;
   virtual PP_Resource CreateVideoCapture(PP_Instance instance) OVERRIDE;
   virtual PP_Resource CreateVideoDecoder(
@@ skipping 33 matching lines @@
 
   Dispatcher* dispatcher_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceCreationProxy);
 };
 
 }  // namespace proxy
 }  // namespace pp
 
 #endif  // PPAPI_PROXY_RESOURCE_CREATION_PROXY_H_