Update from https://crrev.com/316786

testing/test_env.py

 #!/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.
 
 """Sets environment variables needed to run a chromium unit test."""
 
 import os
 import stat
 import subprocess
@@ skipping 55 matching lines @@
   # TODO(glider): remove the symbolizer path once
   # https://code.google.com/p/address-sanitizer/issues/detail?id=134 is fixed.
   symbolizer_path = os.path.abspath(os.path.join(ROOT_DIR, 'third_party',
       'llvm-build', 'Release+Asserts', 'bin', 'llvm-symbolizer'))
 
   if lsan or tsan:
     # LSan is not sandbox-compatible, so we can use online symbolization. In
     # fact, it needs symbolization to be able to apply suppressions.
     symbolization_options = ['symbolize=1',
                              'external_symbolizer_path=%s' % symbolizer_path]
-  elif asan or msan:
-    # ASan uses a script for offline symbolization.
+  elif (asan or msan) and sys.platform not in ['win32', 'cygwin']:
+    # ASan uses a script for offline symbolization, except on Windows.
     # Important note: when running ASan with leak detection enabled, we must use
     # the LSan symbolization options above.
     symbolization_options = ['symbolize=0']
     # Set the path to llvm-symbolizer to be used by asan_symbolize.py
     extra_env['LLVM_SYMBOLIZER_PATH'] = symbolizer_path
+  else:
+    symbolization_options = []
 
   if asan:
     asan_options = symbolization_options[:]
     if lsan:
       asan_options.append('detect_leaks=1')
 
-    extra_env['ASAN_OPTIONS'] = ' '.join(asan_options)
+    if asan_options:
+      extra_env['ASAN_OPTIONS'] = ' '.join(asan_options)
 
     if sys.platform == 'darwin':
       isolate_output_dir = os.path.abspath(os.path.dirname(cmd[0]))
       # This is needed because the test binary has @executable_path embedded in
       # it that the OS tries to resolve to the cache directory and not the
       # mapped directory.
       extra_env['DYLD_LIBRARY_PATH'] = str(isolate_output_dir)
 
   if lsan:
     if asan or msan:
@@ skipping 76 matching lines @@
   # Used by base/base_paths_linux.cc as an override. Just make sure the default
   # logic is used.
   env.pop('CR_SOURCE_ROOT', None)
   extra_env.update(get_sandbox_env(env))
 
   # Copy logic from  tools/build/scripts/slave/runtest.py.
   asan = '--asan=1' in cmd
   lsan = '--lsan=1' in cmd
   msan = '--msan=1' in cmd
   tsan = '--tsan=1' in cmd
-  use_symbolization_script = (asan or msan) and not lsan
+  if sys.platform in ['win32', 'cygwin']:
+    # Symbolization works in-process on Windows even when sandboxed.
+    use_symbolization_script = False
+  else:
+    # LSan doesn't support sandboxing yet, so we use the in-process symbolizer.
+    # Note that ASan and MSan can work together with LSan.
+    use_symbolization_script = (asan or msan) and not lsan
 
   if asan or lsan or msan or tsan:
     extra_env.update(get_sanitizer_env(cmd, asan, lsan, msan, tsan))
 
   if lsan or tsan:
     # LSan and TSan are not sandbox-friendly.
     cmd.append('--no-sandbox')
 
   cmd = trim_cmd(cmd)
 
@@ skipping 28 matching lines @@
     print >> sys.stderr, 'Failed to start %s' % cmd
     raise
 
 
 def main():
   return run_executable(sys.argv[1:], os.environ.copy())
 
 
 if __name__ == '__main__':
   sys.exit(main())