Add support for building targets directly from gyp.

pylib/gyp/generator/ninja.py

 # Copyright (c) 2012 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import copy
 import hashlib
 import os.path
 import re
 import subprocess
 import sys
@@ skipping 1699 matching lines @@
     for short_name in target_short_names:
       master_ninja.build(short_name, 'phony', [x.FinalOutput() for x in
                                                target_short_names[short_name]])
 
   if all_outputs:
     master_ninja.newline()
     master_ninja.build('all', 'phony', list(all_outputs))
     master_ninja.default(generator_flags.get('default_target', 'all'))
 
 
+def PerformBuild(data, configurations, params):
+  options = params['options']
+  for config in configurations:
+    builddir = os.path.join(options.toplevel_dir, 'out', config)
+    arguments = ['ninja', '-C', builddir]
+    print 'Building [%s]: %s' % (config, arguments)
+    subprocess.check_call(arguments)
+
+
 def GenerateOutput(target_list, target_dicts, data, params):
   if params['options'].generator_output:
     raise NotImplementedError, "--generator_output not implemented for ninja"
 
   user_config = params.get('generator_flags', {}).get('config', None)
   if user_config:
     GenerateOutputForConfig(target_list, target_dicts, data, params,
                             user_config)
   else:
     config_names = target_dicts[target_list[0]]['configurations'].keys()
     for config_name in config_names:
       GenerateOutputForConfig(target_list, target_dicts, data, params,
                               config_name)