Android hardware H.264 seems to keep a steady high-QP flow instead of dropping frames, so framedrops aren't sufficient to detect a bad state where downscaling would be beneficial. BUG=webrtc:4968 R=magjed@webrtc.org, stefan@webrtc.org Review URL: https://codereview.webrtc.org/1364253002 . Cr-Commit-Position: refs/heads/master@{#10078}