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This CL moves the AlignedAllocator used in the video encode accelerator
unittest to the video test helpers. This allows it to be reused in a
subsequent CL introducing new video encoder tests.

TEST=./video_encode_accelerator_unittest on nocturne

BUG=1045825

Change-Id: I6a4d837d6f365d6b79878a35b69a5f3267a69c8d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2026513
Commit-Queue: David Staessens <dstaessens@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744873}