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Add a test that tab-index key focus works correctly (the tab-indexable
elements are cycled through in order) when Quick View is displaying a
audio file in its content panel.

Tab past the content panel to skip over checking the focus on the content
webview/audio: these can have multiple internal elements that can
take the focus and our test should be independent of that.

Bug: 907380
Change-Id: Ifd8b298865c05cbfcc318e63b0d701fb6ca8f7d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2004171Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Commit-Queue: Rachel Sugrono <rsugrono@google.com>
Cr-Commit-Position: refs/heads/master@{#732260}