Update from https://crrev.com/317530

third_party/ots/src/hmtx.cc

Index: third_party/ots/src/hmtx.cc
diff --git a/third_party/ots/src/hmtx.cc b/third_party/ots/src/hmtx.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ae86513196a86a33f30850d0a2bb2dc598968700
--- /dev/null
+++ b/third_party/ots/src/hmtx.cc
@@ -0,0 +1,51 @@
+// Copyright (c) 2009 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 "hmtx.h"
+
+#include "hhea.h"
+#include "maxp.h"
+
+// hmtx - Horizontal Metrics
+// http://www.microsoft.com/typography/otspec/hmtx.htm
+
+#define TABLE_NAME "hmtx"
+
+namespace ots {
+
+bool ots_hmtx_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
+  Buffer table(data, length);
+  OpenTypeHMTX *hmtx = new OpenTypeHMTX;
+  file->hmtx = hmtx;
+
+  if (!file->hhea || !file->maxp) {
+    return OTS_FAILURE_MSG("Missing hhea or maxp tables in font, needed by hmtx");
+  }
+
+  if (!ParseMetricsTable(file, &table, file->maxp->num_glyphs,
+                         &file->hhea->header, &hmtx->metrics)) {
+    return OTS_FAILURE_MSG("Failed to parse hmtx metrics");
+  }
+
+  return true;
+}
+
+bool ots_hmtx_should_serialise(OpenTypeFile *file) {
+  return file->hmtx != NULL;
+}
+
+bool ots_hmtx_serialise(OTSStream *out, OpenTypeFile *file) {
+  if (!SerialiseMetricsTable(file, out, &file->hmtx->metrics)) {
+    return OTS_FAILURE_MSG("Failed to serialise htmx metrics");
+  }
+  return true;
+}
+
+void ots_hmtx_free(OpenTypeFile *file) {
+  delete file->hmtx;
+}
+
+}  // namespace ots
+
+#undef TABLE_NAME