Stop silently accepting unsupported flags in test binaries

tools_webrtc/gtest-parallel-wrapper.py

Index: tools_webrtc/gtest-parallel-wrapper.py
diff --git a/tools_webrtc/gtest-parallel-wrapper.py b/tools_webrtc/gtest-parallel-wrapper.py
index e7a659f2861cf01b499e9673316f6fe2414c09f4..de845b0ca739b42ed3143cc2b6eeb5dd9804909e 100755
--- a/tools_webrtc/gtest-parallel-wrapper.py
+++ b/tools_webrtc/gtest-parallel-wrapper.py
@@ -81,6 +81,10 @@ def get_args_and_env():
   parser.add_argument('--isolated-script-test-chartjson-output', type=str,
                       default=None)
 
+  # No-sandbox is a Chromium-specific flag, ignore it.
+  # TODO(oprypin): Remove (bugs.webrtc.org/8115)
+  parser.add_argument('--no-sandbox', action='store_true', default=False)
+
   # We have to do this, since --isolated-script-test-output is passed as an
   # argument to the executable by the swarming scripts, and we want to pass it
   # to gtest-parallel instead.