Move logic of gyp_chromium into gyp_chromium.py

build/gyp_chromium_test.py

 #!/usr/bin/env python
 # Copyright 2015 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 os
 import sys
 import unittest
 
 SCRIPT_DIR = os.path.abspath(os.path.dirname(__file__))
 SRC_DIR = os.path.dirname(SCRIPT_DIR)
 
 sys.path.append(os.path.join(SRC_DIR, 'third_party', 'pymock'))
 
 import mock
 
-# TODO(sbc): Make gyp_chromium more testable by putting the code in
-# a .py file.
-gyp_chromium = __import__('gyp_chromium')
+import gyp_chromium
 
 
 class TestGetOutputDirectory(unittest.TestCase):
   @mock.patch('os.environ', {})
   @mock.patch('sys.argv', [__file__])
   def testDefaultValue(self):
     self.assertEqual(gyp_chromium.GetOutputDirectory(), 'out')
 
   @mock.patch('os.environ', {'GYP_GENERATOR_FLAGS': 'output_dir=envfoo'})
   @mock.patch('sys.argv', [__file__])
@@ skipping 27 matching lines @@
     self.assertEqual(gyp_chromium.GetGypVars([]), {'foo': '1'})
 
   @mock.patch('os.environ', {})
   @mock.patch('sys.argv', [__file__, '-D', 'foo=bar', '-Dbaz'])
   def testDFlagMulti(self):
     self.assertEqual(gyp_chromium.GetGypVars([]), {'foo': 'bar', 'baz': '1'})
 
 
 if __name__ == '__main__':
   unittest.main()