ChromeVox background test on document with switching language.

Currently a trivial test case. Will create a follow up
change to assert that ChromeVox is speaking each phrase in
the correct language.

Change-Id: I9bde58063fd6a5a4eb8a203d3a5124069c6d6b10
Reviewed-on: https://chromium-review.googlesource.com/c/1413397
Commit-Queue: Akihiro Ota <akihiroota@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#623563}
1 file changed