GitLab

- Add "vp09" parsing in widevine_cdm_component_installer.cc
- Add |supports_vp9_profile2| in media::CdmCapability and
  media::mojom::KeySystemCapability.
- In chrome_key_system.cc, read |supports_vp9_profile2| and decide whether
  EME_CODEC_VP9_PROFILE2 is supported.

CDM supports VP9 profile 2.

Bug: 707127
Test: No functionality change for now. Will update test when Widevine
Change-Id: I2441e65dbf29bdc0d30cdb3f5d26e38afd0e90df
Reviewed-on: https://chromium-review.googlesource.com/c/1297462Reviewed-by: John Rummell <jrummell@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603195}