GitLab

This CL updates blink and chromium to support persistent-usage-record
session, which is behind a flag.

To enable the support, use the following command line flag:

--enable-blink-features=EncryptedMediaPersistentUsageRecordSession

ExternalClearKey key system is also updated to declare support
for this session type, even though in the implementation it doesn't do
anything special.

No other CDMs support this session type yet, which will be done later.

TBR=foolip@chromium.org

Bug: 856925
Cq-Include-Trybots: luci.chromium.try:linux_chromium_dbg_ng
Change-Id: Iff38bc79f43e375144f045564e045a830d86699a
Reviewed-on: https://chromium-review.googlesource.com/1119565
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587674}