Chrome Version       : 52.0.2743.82 (Official Build) beta (64-bit)
URLs (if applicable) : https://test.webrtc.org/manual/peer2peer/


What steps will reproduce the problem?
(1) use screen share picker new UI
(2) select "Entire Screen"
(3)

What is the expected result?
screen preview fills complete area

What happens instead?
screen preview is tiny w/ size of "Application Window" preview, especially bad when two screens are used

Please provide any additional information below. Attach a screenshot if
possible.