--no-sandbox is added for Windows ASAN.

As sandbox is not yet supported by ASAN in Windows, it's better to add
--no-sandbox there.

Change-Id: I38430c95b4a0f5cfeee3ab389ddcb3e78721c027
Reviewed-on: https://chromium-review.googlesource.com/968421
Commit-Queue: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544765}

tools/mb/mb.py

@@ -1022,6 +1022,11 @@ def GetIsolateCommand(self, target, vals):
       self.WriteFailureAndRaise('No command line for %s found (test type %s).'
                                 % (target, test_type), output_path=None)
 
+    if is_win and asan:
+      # Sandbox is not yet supported by ASAN for Windows.
+      # Perhaps this is only needed for tests that use the sandbox?
+      cmdline.append('--no-sandbox')
+
     cmdline += isolate_map[target].get('args', [])
 
     return cmdline, extra_files