Stop gyp_chromium prior to mass DLL copies on error

build/gyp_chromium.py

 # 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 argparse
 import gc
@@ skipping 309 matching lines @@
   if mac_toolchain_dir:
     args.append('-Gmac_toolchain_dir=' + mac_toolchain_dir)
 
   if not use_analyzer:
     print 'Updating projects from gyp files...'
     sys.stdout.flush()
 
   # Off we go...
   gyp_rc = gyp.main(args)
 
-  if not use_analyzer:
+  if gyp_rc == 0 and not use_analyzer:
     vs2013_runtime_dll_dirs = vs_toolchain.SetEnvironmentAndGetRuntimeDllDirs()
     if vs2013_runtime_dll_dirs:
       x64_runtime, x86_runtime = vs2013_runtime_dll_dirs
       vs_toolchain.CopyVsRuntimeDlls(
         os.path.join(chrome_src, GetOutputDirectory()),
         (x86_runtime, x64_runtime))
 
   sys.exit(gyp_rc)
 
 if __name__ == '__main__':
   sys.exit(main())