Reland of Stop silently accepting unsupported flags in test binaries (patchset #1 id:1 of https://codereview.webrtc.org/3002963002/ )

Reason for revert:
Relanding without changes.
Problem with unused flags was fixed in
https://codereview.webrtc.org/2998143002/

Original issue's description:
> Revert of Stop silently accepting unsupported flags in test binaries (patchset #5 id:150001 of https://codereview.webrtc.org/2968003003/ )
>
> Reason for revert:
> Causes failures on perf bots
> https://luci-milo.appspot.com/buildbot/client.webrtc.perf/Mac%2010.11/3567
>
> Original issue's description:
> > Stop silently accepting unsupported flags in test binaries
> >
> > Instead explicitly ignore only the flags we know should be ignored.
> >
> > BUG=webrtc:7568
> >
> > Review-Url: https://codereview.webrtc.org/2968003003
> > Cr-Commit-Position: refs/heads/master@{#19412}
> > Committed: a2782f6f5d
>
> TBR=kjellander@webrtc.org,henrika@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:7568
>
> Review-Url: https://codereview.webrtc.org/3002963002
> Cr-Commit-Position: refs/heads/master@{#19413}
> Committed: d64072c598

TBR=kjellander@webrtc.org,henrika@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=webrtc:7568

Review-Url: https://codereview.webrtc.org/2999383002
Cr-Commit-Position: refs/heads/master@{#19455}

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.