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This CL implements the functionality to extract one encoded video key
frame in utility process with ffmpeg for video thumbnail retrieval.

The decoding will be done in later CLs with MojoVideoDecoder.

TBR=dtrainor@chromium.org

Bug: 826021
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: Ia36ffe5ab4bb6fc32e55f1de089f07046e72a1bd
Reviewed-on: https://chromium-review.googlesource.com/1145780
Commit-Queue: Xing Liu <xingliu@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: Martin Barbella <mbarbella@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588946}