Automatically set correct Observatory analytics version

tools/observatory_tool.py

 #!/usr/bin/env python
 # Copyright (c) 2015, 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.
 """Helper for building and deploying Observatory"""
 
 import argparse
 import os
 import platform
 import shutil
@@ skipping 121 matching lines @@
                       options.pub_executable,
                       options.pub_snapshot,
                       options.package_root,
                       ['get', '--offline'],
                       options.silent)
   elif (cmd == 'build'):
     return PubCommand(options.dart_executable,
                       options.pub_executable,
                       options.pub_snapshot,
                       options.package_root,
-                      ['build', '--output', args[0]],
+                      ['build',
+                       '-DOBS_VER=' + utils.GetVersion(),
+                       '--output', args[0]],
                       options.silent)
   elif (cmd == 'deploy'):
     Deploy('build', 'deployed')
   elif (cmd == 'rewrite'):
     RewritePubSpec(args[0], args[1], args[2], args[3])
   else:
     print >> sys.stderr, ('ERROR: command "%s" not supported') % (cmd)
     return -1;
 
 def main():
@@ skipping 13 matching lines @@
   if (options.pub_snapshot != None):
     options.pub_snapshot = os.path.abspath(options.pub_snapshot)
   if len(args) == 1:
     args[0] = os.path.abspath(args[0])
   # Pub must be run from the project's root directory.
   ChangeDirectory(options.directory)
   return ExecuteCommand(options, args)
 
 if __name__ == '__main__':
   sys.exit(main());