glaznev 919ff75376 Use high QP threshold for HW VP8 encoder frame downscaling.
Before HW VP8 downscaling was triggered by frame drops only.
Also reset the encoder when it drops large amount of frames in a row.

BUG=b/26504665

Review URL: https://codereview.webrtc.org/1592883004

Cr-Commit-Position: refs/heads/master@{#11406}
2016-01-27 23:01:08 +00:00
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