Update from https://crrev.com/316786

testing/test_env.py

Index: testing/test_env.py
diff --git a/testing/test_env.py b/testing/test_env.py
index 66a3721beccb78c05d6299b6671a9ae2faf607a8..d19f74feee99b5f27c6d7e7ec9ca1a2133f1c554 100755
--- a/testing/test_env.py
+++ b/testing/test_env.py
@@ -73,20 +73,23 @@ def get_sanitizer_env(cmd, asan, lsan, msan, tsan):
     # 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]))
@@ -183,7 +186,13 @@ def run_executable(cmd, env):
   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))