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Getting the visible rectangle is a common operation that will be used by
both the VDA decoder and the VD. Factorize it into a single method.

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

Change-Id: I1d254a7007bcd5919a8c9639b90c72c0f4adacd7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2131431
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Chih-Yu Huang <akahuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756177}