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This adds NV12Dmabuf cropping test case, where the visible rectangle of
fed VideoFrames to an encoder doesn't start with (0, 0).

Bug: b:174318867, b:172210338
Test: video_encode_accelerator_tests --gtest_also_run_disabled_tests on atlas
Change-Id: I1361011344a685484bb7098e0f3507dc8014b2aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2563391
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: David Staessens <dstaessens@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834126}