Fixes target bitrate calculation for framerate based adjuster. Adds new API to bitrate adjuster - getCodecConfigFramerate() - that returns the FPS that should be passed to MediaCodec on initialization. Bug: b/73741487, cl/186656928 Change-Id: Ia4a5e99d302de67fbee0c132ab8e9392bc205b44 Reviewed-on: https://webrtc-review.googlesource.com/65162 Reviewed-by: Magnus Jedvert <magjed@webrtc.org> Commit-Queue: Sami Kalliomäki <sakal@webrtc.org> Cr-Commit-Position: refs/heads/master@{#22716}