GitLab

Add cmdline switch::kEnableWebRtcHWH264Encoding to control whether
to report WebRtc HW H264 encoding capability.

BUG=385941
R=xiyuan@chromium.org,kalman@chromium.org,posicak@chromium.org,jamesr@chromium.org
TBR=piman@chromium.org

Review URL: https://codereview.chromium.org/453063002

Cr-Commit-Position: refs/heads/master@{#292028}