Update from https://crrev.com/317530

third_party/ots/src/vmtx.cc

Index: third_party/ots/src/vmtx.cc
diff --git a/third_party/ots/src/vmtx.cc b/third_party/ots/src/vmtx.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e29d32b29f9b55de3a76727a2d0af75f656b860d
--- /dev/null
+++ b/third_party/ots/src/vmtx.cc
@@ -0,0 +1,55 @@
+// 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.
+
+#include "vmtx.h"
+
+#include "gsub.h"
+#include "maxp.h"
+#include "vhea.h"
+
+// vmtx - Vertical Metrics Table
+// http://www.microsoft.com/typography/otspec/vmtx.htm
+
+#define TABLE_NAME "vmtx"
+
+namespace ots {
+
+bool ots_vmtx_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
+  Buffer table(data, length);
+  OpenTypeVMTX *vmtx = new OpenTypeVMTX;
+  file->vmtx = vmtx;
+
+  if (!file->vhea || !file->maxp) {
+    return OTS_FAILURE_MSG("vhea or maxp table missing as needed by vmtx");
+  }
+
+  if (!ParseMetricsTable(file, &table, file->maxp->num_glyphs,
+                         &file->vhea->header, &vmtx->metrics)) {
+    return OTS_FAILURE_MSG("Failed to parse vmtx metrics");
+  }
+
+  return true;
+}
+
+bool ots_vmtx_should_serialise(OpenTypeFile *file) {
+  // vmtx should serialise when vhea and GSUB are preserved.
+  // See the comment in ots_vhea_should_serialise().
+  return file->vmtx != NULL && file->vhea != NULL &&
+      ots_gsub_should_serialise(file);
+}
+
+bool ots_vmtx_serialise(OTSStream *out, OpenTypeFile *file) {
+  if (!SerialiseMetricsTable(file, out, &file->vmtx->metrics)) {
+    return OTS_FAILURE_MSG("Failed to write vmtx metrics");
+  }
+  return true;
+}
+
+void ots_vmtx_free(OpenTypeFile *file) {
+  delete file->vmtx;
+}
+
+}  // namespace ots
+
+#undef TABLE_NAME