Make skydb chromoting aware

sky/tools/skydb

 #!/usr/bin/env python
 # Copyright 2014 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 argparse
 import logging
 import os
 from skypy.paths import Paths
 import socket;
@@ skipping 40 matching lines @@
         else:
             server_command = [
                 os.path.join(self.paths.sky_tools_directory, 'sky_server'),
                 '--debug',
                 server_root,
                 str(HTTP_PORT),
             ]
             self._sky_server = subprocess.Popen(server_command)
         return 'http://localhost:%s/%s' % (HTTP_PORT, relative_path)
 
+    def _in_chromoting(self):
+        return os.environ.get('CHROME_REMOTE_DESKTOP_SESSION', False)
+
     def main(self):
         logging.basicConfig(level=logging.INFO)
 
         parser = argparse.ArgumentParser(description='Sky launcher/debugger')
         parser.add_argument('--gdb', action='store_true')
-        parser.add_argument('--use-osmesa', action='store_true')
+        parser.add_argument('--use-osmesa', action='store_true',
+            default=self._in_chromoting())
         parser.add_argument('url', nargs='?', type=str)
         args = parser.parse_args()
 
         content_handlers = ['%s,%s' % (mime_type, 'mojo:sky_viewer')
             for mime_type in SUPPORTED_MIME_TYPES]
         shell_command = [
             self.paths.mojo_shell_path,
             '--v=1',
             '--content-handlers=%s' % ','.join(content_handlers),
             '--url-mappings=mojo:window_manager=mojo:sky_debugger',
@@ skipping 20 matching lines @@
 
 
 if __name__ == '__main__':
     skydb = SkyDebugger()
     try:
         skydb.main()
     except (KeyboardInterrupt, SystemExit):
         pass
     finally:
         skydb.shutdown()