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Getting the currently set format on a queue is a frequent operation. Add
a dedicated method for this so we can factorize the code across the
various users.

BUG=b:149663704
TEST=vdatest passing on Kukui.
TEST=vdatest passing on Hana.

Change-Id: Ie98b86db7a40d277adaab04703327340c61dfddf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2131430
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Chih-Yu Huang <akahuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756156}