Include VS2013 runtime folders in PATH for automatic toolchain

build/gyp_chromium

 #!/usr/bin/env python
 
 # Copyright (c) 2012 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.
 
 # This script is wrapper for Chromium that adds some support for how GYP
 # is invoked by Chromium beyond what can be done in the gclient hooks.
 
 import glob
@@ skipping 258 matching lines @@
     os.environ['GYP_MSVS_OVERRIDE_PATH'] = toolchain
     os.environ['GYP_MSVS_VERSION'] = '2013'
     # We need to make sure windows_sdk_path is set to the automated toolchain
     # values in GYP_DEFINES, but don't want to override any other values there.
     gyp_defines_dict = gyp.NameValueListToDict(gyp.ShlexEnv('GYP_DEFINES'))
     win8sdk = os.path.join(toolchain, 'win8sdk')
     gyp_defines_dict['windows_sdk_path'] = win8sdk
     os.environ['WINDOWSSDKDIR'] = win8sdk
     os.environ['GYP_DEFINES'] = ' '.join('%s=%s' % (k, pipes.quote(str(v)))
         for k, v in gyp_defines_dict.iteritems())
+    # Include the VS runtime in the PATH in case it's not machine-installed.
+    runtime_path = ';'.join(
+        os.path.normpath(os.path.join(
+            script_dir, '..', 'third_party', 'win_toolchain', 'files', s))
+        for s in ('sys64', 'sys32'))
+    os.environ['PATH'] = runtime_path + os.environ['PATH']
     print('Using automatic toolchain in %s.' % toolchain)
 
   # If CHROMIUM_GYP_SYNTAX_CHECK is set to 1, it will invoke gyp with --check
   # to enfore syntax checking.
   syntax_check = os.environ.get('CHROMIUM_GYP_SYNTAX_CHECK')
   if syntax_check and int(syntax_check):
     args.append('--check')
 
   print 'Updating projects from gyp files...'
   sys.stdout.flush()
 
   # Off we go...
   sys.exit(gyp.main(args))