minyue 58e08cbea8 Reset indexer upon initialization in AudioLoop.
The array is reset in Init() but not the indexer. This makes the start point undefined after Init() for re-initializing an AudioLoop. This can be fixed.

BUG=

Review URL: https://codereview.webrtc.org/1727353002

Cr-Commit-Position: refs/heads/master@{#11739}
2016-02-24 11:49:23 +00:00
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