a5dec16b42
Provides a better string (provides names of all implementations), but also fixes a crash when accessing the ImplementationName() of SimulcastEncoderAdapter where InitEncode has failed. BUG=chromium:577932, webrtc:4897 R=stefan@webrtc.org Review URL: https://codereview.webrtc.org/1599353003 . Cr-Commit-Position: refs/heads/master@{#11321}