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The preview video element is not interactable with chromevox. This CL
prevent chromevox navigate to preview by creating preview video from
template with aria-hide=true.

Bug: 1135052
Test: Manually with chromevox
Test: tast run <DUT> "camera.CCAUI*"

Change-Id: I1dfc87b564dd1db119c10643b587fa254470493a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454913
Auto-Submit: Inker Kuo <inker@chromium.org>
Commit-Queue: Shik Chen <shik@chromium.org>
Reviewed-by: Shik Chen <shik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814585}