DevTools: add axe-core test for the WebAudio tool

Bug: 963183
Change-Id: I16c95430821e329433334a9d6515b9c3fc555f20
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1711061
Reviewed-by: Erik Luo <luoe@chromium.org>
Commit-Queue: John Emau <johnemau@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#682086}
2 files changed