Make path to wav file for jitter buffer simulation in event_log_visualizer configurable.
Make path to wav file for jitter buffer simulation in event_log_visualizer configurable.

BUG=webrtc:7467

Review-Url: https://codereview.webrtc.org/2996953002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#19364}

ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc