diff --git a/gfx/ots/include/opentype-sanitiser.h b/gfx/ots/include/opentype-sanitiser.h
--- a/gfx/ots/include/opentype-sanitiser.h
+++ b/gfx/ots/include/opentype-sanitiser.h
@@ -176,18 +176,20 @@ class OTSStream {
 
 // -----------------------------------------------------------------------------
 // Process a given OpenType file and write out a sanitised version
 //   output: a pointer to an object implementing the OTSStream interface. The
 //     sanitisied output will be written to this. In the even of a failure,
 //     partial output may have been written.
 //   input: the OpenType file
 //   length: the size, in bytes, of |input|
+//   preserve_graphite_tables: whether to preserve Graphite Layout tables
 // -----------------------------------------------------------------------------
-bool Process(OTSStream *output, const uint8_t *input, size_t length);
+bool Process(OTSStream *output, const uint8_t *input, size_t length,
+             bool preserve_graphite_tables = false);
 
 // Force to disable debug output even when the library is compiled with
 // -DOTS_DEBUG.
 void DisableDebugOutput();
 
 }  // namespace ots
 
 #endif  // OPENTYPE_SANITISER_H_
diff --git a/gfx/ots/src/ots.cc b/gfx/ots/src/ots.cc
--- a/gfx/ots/src/ots.cc
+++ b/gfx/ots/src/ots.cc
@@ -138,16 +138,27 @@ const struct {
   { "GPOS", ots::ots_gpos_parse, ots::ots_gpos_serialise,
     ots::ots_gpos_should_serialise, ots::ots_gpos_free, false },
   { "GSUB", ots::ots_gsub_parse, ots::ots_gsub_serialise,
     ots::ots_gsub_should_serialise, ots::ots_gsub_free, false },
   { "vhea", ots::ots_vhea_parse, ots::ots_vhea_serialise,
     ots::ots_vhea_should_serialise, ots::ots_vhea_free, false },
   { "vmtx", ots::ots_vmtx_parse, ots::ots_vmtx_serialise,
     ots::ots_vmtx_should_serialise, ots::ots_vmtx_free, false },
+  // SILGraphite layout tables - not actually parsed, just copied
+  { "Silf", ots::ots_silf_parse, ots::ots_silf_serialise,
+    ots::ots_silf_should_serialise, ots::ots_silf_free, false },
+  { "Sill", ots::ots_sill_parse, ots::ots_sill_serialise,
+    ots::ots_sill_should_serialise, ots::ots_sill_free, false },
+  { "Gloc", ots::ots_gloc_parse, ots::ots_gloc_serialise,
+    ots::ots_gloc_should_serialise, ots::ots_gloc_free, false },
+  { "Glat", ots::ots_glat_parse, ots::ots_glat_serialise,
+    ots::ots_glat_should_serialise, ots::ots_glat_free, false },
+  { "Feat", ots::ots_feat_parse, ots::ots_feat_serialise,
+    ots::ots_feat_should_serialise, ots::ots_feat_free, false },
   // TODO(bashi): Support mort, base, and jstf tables.
   { 0, NULL, NULL, NULL, NULL, false },
 };
 
 bool IsValidVersionTag(uint32_t tag) {
   return tag == Tag("\x00\x01\x00\x00") ||
          // OpenType fonts with CFF data have 'OTTO' tag.
          tag == Tag("OTTO") ||
@@ -581,22 +592,25 @@ bool ProcessGeneric(ots::OpenTypeFile *h
 }  // namespace
 
 namespace ots {
 
 void DisableDebugOutput() {
   g_debug_output = false;
 }
 
-bool Process(OTSStream *output, const uint8_t *data, size_t length) {
+bool Process(OTSStream *output, const uint8_t *data, size_t length,
+             bool preserveGraphite) {
   OpenTypeFile header;
   if (length < 4) {
     return OTS_FAILURE();
   }
 
+  header.preserve_graphite = preserveGraphite;
+
   bool result;
   if (data[0] == 'w' && data[1] == 'O' && data[2] == 'F' && data[3] == 'F') {
     result = ProcessWOFF(&header, output, data, length);
   } else {
     result = ProcessTTF(&header, output, data, length);
   }
 
   for (unsigned i = 0; ; ++i) {
diff --git a/gfx/ots/src/ots.h b/gfx/ots/src/ots.h
--- a/gfx/ots/src/ots.h
+++ b/gfx/ots/src/ots.h
@@ -178,17 +178,22 @@ class Buffer {
   F(maxp, MAXP) \
   F(name, NAME) \
   F(os2, OS2) \
   F(post, POST) \
   F(prep, PREP) \
   F(vdmx, VDMX) \
   F(vorg, VORG) \
   F(vhea, VHEA) \
-  F(vmtx, VMTX)
+  F(vmtx, VMTX) \
+  F(silf, SILF) \
+  F(sill, SILL) \
+  F(glat, GLAT) \
+  F(gloc, GLOC) \
+  F(feat, FEAT)
 
 #define F(name, capname) struct OpenType##capname;
 FOR_EACH_TABLE_TYPE
 #undef F
 
 struct OpenTypeFile {
   OpenTypeFile() {
 #define F(name, capname) name = NULL;
@@ -197,16 +202,20 @@ struct OpenTypeFile {
   }
 
   uint32_t version;
   uint16_t num_tables;
   uint16_t search_range;
   uint16_t entry_selector;
   uint16_t range_shift;
 
+  // This is used to tell the relevant parsers whether to preserve the
+  // Graphite layout tables (currently _without_ any checking)
+  bool preserve_graphite;
+
 #define F(name, capname) OpenType##capname *name;
 FOR_EACH_TABLE_TYPE
 #undef F
 };
 
 #define F(name, capname) \
 bool ots_##name##_parse(OpenTypeFile *f, const uint8_t *d, size_t l); \
 bool ots_##name##_should_serialise(OpenTypeFile *f); \