Change our encoding for javac compiles to explicitly use UTF-8.

editor/tools/compile_analyzer.py

 #!/usr/bin/env python
 # Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 #
 # Script to compile the analyzer.
 #
 # Usage: compile_analyzer.py OPTIONS files
 #
 
@@ skipping 26 matching lines @@
   # We rely on all jar files being copied to the output dir.
   if sys.platform == 'win32':
     class_path = options.output_dir + '*;'
   else:
     class_path = options.output_dir + '*'
   cmd = [GetJavacPath(),
          '-sourcepath', 'foobar',
          '-source', '6',
          '-target', '6',
          '-implicit:none',
+         '-encoding', 'UTF-8',
          '-d', options.output_dir,
          '-cp', class_path,
          ]
   cmd.extend(args)
   exit_code = subprocess.call(cmd)
   if exit_code:
     raise Exception("Executing command [%s] failed" % cmd)
 
 def CreateJarFile(options):
   class_path_file_name = options.output_dir + options.class_path_file
@@ skipping 49 matching lines @@
   os.makedirs(options.output_dir)
 
   CopyFiles(options)
   CreateClassPathFile(options)
   CompileAnalyzer(options, args)
   CreateJarFile(options)
 
 
 if __name__=='__main__':
   main()