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Fixed a bug that would prevent using absolute input file paths. This is required
by tast, since the test image data is uploaded to a custom directory.

Temporary files are generated, written to a temporary file, and read into memory
again. This unnecessary step has been removed. File operations introduce
additional points of failure, and it can be tricky to write to temporary files
when using the Tast framework. This also prevents files cluttering the temp
folder when not being cleaned up on crashes.

The encode output of generated images is now written to the current folder using
HxW_[black|white].jpg as output file name.

TEST=ran jpeg_encode_accelerator_unittest on eve

BUG=899605

Change-Id: Ie3f0e299ef85ce663586b4ba4c1177e84ec7a8ca
Reviewed-on: https://chromium-review.googlesource.com/c/1333011
Commit-Queue: David Staessens <dstaessens@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608176}