[OTS] build failure on android_aosp

src/woff2.cc

 // Copyright (c) 2013 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.
 
 // This is the implementation of decompression of the proposed WOFF Ultra
 // Condensed file format.
 
 #include <cassert>
 #include <cstdlib>
 #include <vector>
@@ skipping 808 matching lines @@
     if ((flags & kWoff2FlagsTransform) != 0) {
       if (!ReadBase128(file, &transform_length)) {
         return OTS_FAILURE();
       }
     }
     uint32_t src_length = transform_length;
     if ((flag_byte >> 6) == 1 || (flag_byte >> 6) == 2) {
       if (!ReadBase128(file, &src_length)) {
         return OTS_FAILURE();
       }
-    } else if ((flag_byte >> 6) == kShortFlagsContinue) {
+    } else if (static_cast<uint32_t>(flag_byte >> 6) == kShortFlagsContinue) {
       // The compressed data for this table is in a previuos table, so we set
       // the src_length to zero.
       src_length = 0;
     }
     // Disallow huge numbers (> 1GB) for sanity.
     if (src_length > 1024 * 1024 * 1024 ||
         transform_length > 1024 * 1024 * 1024 ||
         dst_length > 1024 * 1024 * 1024) {
       return OTS_FAILURE();
     }
@@ skipping 182 matching lines @@
       if (transform_buf > &uncompressed_buf[0] + uncompressed_buf.size()) {
         return OTS_FAILURE();
       }
     }
   }
 
   return FixChecksums(tables, result);
 }
 
 }  // namespace ots