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- Added codec_picture.cc because the constructor and destructor are
  now "complex".
- The DecryptConfig describes the decryption config of the input
  stream for this picture

Bug: 838673
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: I84f202faae6a1dde2e3fec5f0535d349c2ec3d96
Reviewed-on: https://chromium-review.googlesource.com/1038157Reviewed-by: Pawel Osciak <posciak@chromium.org>
Commit-Queue: Rintaro Kuroiwa <rkuroiwa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560285}