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- Scale down to VGA immediately if call starts with HD resolution and bitrate below 500 kbps. - Adjust QP threshold for HW VP8 encoder to scale down faster. BUG=b/26504665 R=mflodman@webrtc.org, pbos@webrtc.org, sprang@google.com, stefan@webrtc.org Review URL: https://codereview.webrtc.org/1672173002 . Cr-Commit-Position: refs/heads/master@{#11692}