* Increase 540p bitrate to 1.2mbps from 0.9mpbs.
960x540 bitrate was by far smallest in terms of bits per pixel. This change
brings it closer to other resolutions.
* Interpolate max/target/min bitrates for non-standard resolutions based
on number of pixels.
Bug: webrtc:10965
Change-Id: If0aa56bb4c614ca09ee39d3a2b700aab2ffa1a2c
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/152828
Commit-Queue: Ilya Nikolaevskiy <ilnik@webrtc.org>
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29195}
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