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This CL adds consideration for a frame's visible_rect when creating an
image bitmap, instead of using only the coded_rect. This fixes rows of
pixels being repeated at the bottom of an image.

Bug: 1145244
Change-Id: I534a9e768203ceee889827c370d2acfd574c77fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518108Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823786}