zijiehe e83f4b3835 Enable screen capturer tests for Linux / DirectX capturer / magnifier capturer
GDI capturer may randomly return a blank frame. So this change enables tests for
Linux / DirectX capturer / magnifier capturer.

BUG=webrtc:6666

Review-Url: https://codereview.webrtc.org/2559583002
Cr-Commit-Position: refs/heads/master@{#15489}
2016-12-08 19:47:09 +00:00
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