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

webkit/plugins/ppapi/plugin_module.cc

Index: webkit/plugins/ppapi/plugin_module.cc
===================================================================
--- webkit/plugins/ppapi/plugin_module.cc	(revision 95011)
+++ webkit/plugins/ppapi/plugin_module.cc	(working copy)
@@ -308,8 +308,10 @@
     return PPB_Proxy_Impl::GetInterface();
   if (strcmp(name, PPB_QUERY_POLICY_DEV_INTERFACE_0_1) == 0)
     return ::ppapi::thunk::GetPPB_QueryPolicy_Thunk();
+  if (strcmp(name, PPB_SCROLLBAR_DEV_INTERFACE_0_5) == 0)
+    return ::ppapi::thunk::GetPPB_Scrollbar_Thunk();
   if (strcmp(name, PPB_SCROLLBAR_DEV_INTERFACE_0_4) == 0)
-    return ::ppapi::thunk::GetPPB_Scrollbar_Thunk();
+    return PPB_Scrollbar_Impl::Get0_4Interface();
   if (strcmp(name, PPB_SCROLLBAR_DEV_INTERFACE_0_3) == 0)
     return PPB_Scrollbar_Impl::Get0_3Interface();
   if (strcmp(name, PPB_UMA_PRIVATE_INTERFACE) == 0)