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There are some tests that create own cmdline that results in
missing kEnableFeatures and kOzonePlatform switches. As a consequence,
the browser parts start with a wrong config, which results in
failures and usage of the non-Ozone path for the use_x11 && use_ozone
config, and also in usage of the wrong OzonePlatform as it doesn't
know what platform the test has been launched with (linux-ozone-rel
testers pass headless/wayland/x11 to the cmdline, for example).

Solution is to copy all the previous switches.

Bug: 1115055
Change-Id: Ia7a1f2688b1d697073a96c6527145342deb13778
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2346355
Commit-Queue: Maksim Sisov (GMT+3) <msisov@igalia.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Jonathan Ross <jonross@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799287}