tommi 8eb0751b2e Provide a default return value for mock_audio_device_.TimeUntilNextProcess.
By default the return value will be 0, which if we hit, could cause busy loops.

BUG=webrtc:7187

Review-Url: https://codereview.webrtc.org/2750503002
Cr-Commit-Position: refs/heads/master@{#17213}
2017-03-13 15:23:35 +00:00
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