Update from https://crrev.com/314320

build/android/gyp/javac.py

 #!/usr/bin/env python
 #
 # Copyright 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.
 
 import fnmatch
 import optparse
 import os
 import shutil
@@ skipping 54 matching lines @@
 
   jar_inputs = []
   for path in classpath:
     if os.path.exists(path + '.TOC'):
       jar_inputs.append(path + '.TOC')
     else:
       jar_inputs.append(path)
 
   javac_args = [
       '-g',
+      # Chromium only allows UTF8 source files.  Being explicit avoids
+      # javac pulling a default encoding from the user's environment.
+      '-encoding', 'UTF-8',
       '-source', '1.7',
       '-target', '1.7',
       '-classpath', ':'.join(classpath),
       '-d', classes_dir]
   if chromium_code:
     javac_args.extend(['-Xlint:unchecked', '-Xlint:deprecation'])
   else:
     # XDignore.symbol.file makes javac compile against rt.jar instead of
     # ct.sym. This means that using a java internal package/class will not
     # trigger a compile warning or error.
@@ skipping 170 matching lines @@
         input_files + build_utils.GetPythonDependencies())
 
   if options.stamp:
     build_utils.Touch(options.stamp)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))