GitLab

Re-landing the CL reverted here:
https://codereview.chromium.org/866573004

Opus audio codec is supported by the android platform starting from
Lollipop.  This CL enables canPlayType() support for Opus on Clank and
MSE playback of Opus in Clank. This brings Opus feature parity with
Desktop Chromium.

BUG=318436
TBR=jschuh,rsleevi

Review URL: https://codereview.chromium.org/898393002

Cr-Commit-Position: refs/heads/master@{#315132}