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  $ gn args out/Default
  # In the editor, add the following build argument:
  # enable_libgav1_decoder = true
  $ autoninja -C out/Default media_unittests
  $ out/Default/media_unittests
  $ out/Default/media_unittests --enable-features=Gav1VideoDecoder

Tested: 
Bug: 1026522
Change-Id: I2b033b5993b69a5e58d670434726d9e8d8b69e6a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040434Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Wan-Teh Chang <wtc@google.com>
Cr-Commit-Position: refs/heads/master@{#738854}