[OTLayout] Add is_inplace() method to GSUB

src/hb-ot-layout-gpos-table.hh

diff --git a/src/hb-ot-layout-gpos-table.hh b/src/hb-ot-layout-gpos-table.hh
index 56b3a4f..a9933d1 100644
--- a/src/hb-ot-layout-gpos-table.hh
+++ b/src/hb-ot-layout-gpos-table.hh
@@ -1,6 +1,6 @@
 /*
  * Copyright © 2007,2008,2009,2010  Red Hat, Inc.
- * Copyright © 2010,2012  Google, Inc.
+ * Copyright © 2010,2012,2013  Google, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
@@ -1429,6 +1429,12 @@
   inline const PosLookupSubTable& get_subtable (unsigned int i) const
   { return this+CastR<OffsetArrayOf<PosLookupSubTable> > (subTable)[i]; }
 
+  inline hb_is_inplace_context_t::return_t is_inplace (hb_is_inplace_context_t *c) const
+  {
+    TRACE_IS_INPLACE (this);
+    return TRACE_RETURN (true);
+  }
+
   inline hb_collect_glyphs_context_t::return_t collect_glyphs_lookup (hb_collect_glyphs_context_t *c) const
   {
     TRACE_COLLECT_GLYPHS (this);