Use QualityScaler for OpenH264 encoder.

BUG=
R=sprang@webrtc.org

Review URL: https://codereview.webrtc.org/2077393003 .

Cr-Original-Commit-Position: refs/heads/master@{#13222}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 6d3e0c22c31bab111be833d598eea6118dfe0e83
2 files changed