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The VAAPI JPEG decoder on some platforms won't convert the decoded images to the
I420 format, but will return the decoded images in their original pixel format.
This means a conversion must be done in the VAAPI wrapper to the expected I420
output format. This change adds a SamplingFormatChange test that will test
whether the conversion is successful for JPEGS with different sampling formats.

Additional cleanup:
* Added some comments for clarification

TEST=ran JDA tests on eve and grunt

Bug: 828119
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Ibade43422590268d774b8d330097e46a8a33bca1
Reviewed-on: https://chromium-review.googlesource.com/1218386Reviewed-by: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Pawel Osciak <posciak@chromium.org>
Reviewed-by: Leon Scroggins <scroggo@chromium.org>
Commit-Queue: David Staessens <dstaessens@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592683}