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Originally AlignedDataHelper produces UNOWNED_MEMORY VideoFrame
from aligned data. This CL improves the AlignedDataHelper code
in order to return MojoSharedMemory VideoFrames. AlignedDataHelper
saves aligned data to mojo::ScopedSharedBufferHandle, and creates
a new MojoSharedMemoryHandle by duplicating the handle.

Bug: 1045825
Test: video_encode_accelerator_tests on eve
Change-Id: I2914891c4e37f76f35c4a32685f935b6d76b7c66
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2250144Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: David Staessens <dstaessens@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786192}