Add support for H264 high-profile in injectable video encoder.

BUG=webrtc:7760

Review-Url: https://codereview.webrtc.org/3007133002
Cr-Original-Commit-Position: refs/heads/master@{#19774}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: c36daecd7785585cbd6665b8527e307bdb109992
3 files changed