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.
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-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#17213}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 8eb0751b2e53e43b2eb0bdb521114f22e5754ac4

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