GitLab

This is adding an DecodingInfo class that carries key system access
information back and create a MediaKeySystemAccess.

This implementation in //media/blink is a stub that is meant to only
pass WPT tests at the moment.

Bug: 907909
Change-Id: I3bac0087ca3051defb8b47d10fffdb6052814ae9
Reviewed-on: https://chromium-review.googlesource.com/c/1348733
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611917}