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

webkit/plugins/ppapi/resource_creation_impl.cc

Index: webkit/plugins/ppapi/resource_creation_impl.cc
===================================================================
--- webkit/plugins/ppapi/resource_creation_impl.cc	(revision 95420)
+++ webkit/plugins/ppapi/resource_creation_impl.cc	(working copy)
@@ -25,6 +25,7 @@
 #include "webkit/plugins/ppapi/ppb_image_data_impl.h"
 #include "webkit/plugins/ppapi/ppb_input_event_impl.h"
 #include "webkit/plugins/ppapi/ppb_scrollbar_impl.h"
+#include "webkit/plugins/ppapi/ppb_scrollbar_group_impl.h"
 #include "webkit/plugins/ppapi/ppb_surface_3d_impl.h"
 #include "webkit/plugins/ppapi/ppb_transport_impl.h"
 #include "webkit/plugins/ppapi/ppb_url_loader_impl.h"
@@ -259,10 +260,16 @@
 }
 
 PP_Resource ResourceCreationImpl::CreateScrollbar(PP_Instance instance,
+                                                  PP_Resource scrollbar_group,
                                                   PP_Bool vertical) {
-  return ReturnResource(new PPB_Scrollbar_Impl(instance_, PP_ToBool(vertical)));
+  return PPB_Scrollbar_Impl::Create(
+      instance_, scrollbar_group, PP_ToBool(vertical));
 }
 
+PP_Resource ResourceCreationImpl::CreateScrollbarGroup(PP_Instance instance) {
+  return ReturnResource(new PPB_ScrollbarGroup_Impl(instance_));
+}
+
 PP_Resource ResourceCreationImpl::CreateSurface3D(
     PP_Instance instance,
     PP_Config3D_Dev config,