Update woff2 to 4e698b8

third_party/woff2/src/transform.h

 // Copyright 2013 Google Inc. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 // http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 //
 // Library for preprocessing fonts as part of the WOFF 2.0 conversion.
 
 #ifndef WOFF2_TRANSFORM_H_
 #define WOFF2_TRANSFORM_H_
 
 #include "./font.h"
 
 namespace woff2 {
 
 // Adds the transformed versions of the glyf and loca tables to the font. The
 // transformed loca table has zero length. The tag of the transformed tables is
 // derived from the original tag by flipping the MSBs of every byte.
 bool TransformGlyfAndLocaTables(Font* font);
 
+// Apply transformation to hmtx table if applicable for this font.
+bool TransformHmtxTable(Font* font);
+
 } // namespace woff2
 
 #endif  // WOFF2_TRANSFORM_H_