commit a539416c1f041af93e054d1cd397f895762022bc
author John Rummell <jrummell@chromium.org> Thu Oct 03 21:39:30 2019
committer Commit Bot <commit-bot@chromium.org> Thu Oct 03 21:39:30 2019
tree 1a39a6d8797a010ab76f6576b790e61cc2730d80
parent c27dbd6362ac3b41d047401d4ce16cce0052daf2

Enable component updated Widevine CDM on desktop Linux

On Linux the Widevine CDM is loaded into the zygote at startup. When the
component updater runs sometime later and finds a newer version of the
Widevine CDM, don't register it as the newer version can't be used.
Instead, similar to Flash, save the path to the new Widevine CDM in the
file latest-component-updated-widevine-cdm. Next time at startup this
file will be checked, and if it references a usable Widevine CDM, use
this version instead of the bundled CDM.

Tested this by running Chrome built with an older version of the
Widevine CDM, and then checking chrome://components for a newer (QA)
version. As there is one, it gets updated. When restarting Chrome, the
newer version is loaded. In both cases Widevine content was played using
Shaka.

Bug: 971433
Test: see description, plus new unit_tests pass
Change-Id: I2d188f5206ba45de8e87b7c51cb45a59a2875b19
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1826077
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Sorin Jianu <sorin@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702592}