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Insted of using a fixed frame rate, we allow the camera to use a lower frame rate. The camera will choose depending on lightning condition. TESTED= In a room with low light on N5, N6 N7, Galaxy 4. BUG=webrtc:5262 R=magjed@webrtc.org Review URL: https://codereview.webrtc.org/1479563004 . Cr-Commit-Position: refs/heads/master@{#10807}