Per 766ad3b989 This cl do a major cleanup of the VideoAdapter and make sure it does care about the VideoSinkWants.max_pixel_count and VideoSinkWants.max_pixel_count_step_up.
Unit tests are updated to test that screen share is not adapted but it does not change the VideoSinkWants in WebRtcVideoEngine2::SendStream due to a switch to screen share. The reason is that it works anyway and sprang is looking into how to do adaptation based on frame rate as well and use the adapter for screen share as well.

BUG=webrtc:5688, webrtc:5426
R=nisse@webrtc.org, pbos@webrtc.org, sprang@google.com

Review URL: https://codereview.webrtc.org/1836043004 .

Cr-Commit-Position: refs/heads/master@{#12240}
2016-04-05 13:23:58 +00:00
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