Make play-sound an util function, decoupling from Options.

1. Add sound.js that simplifies adding and playing sounds.
2. Define audio resources in html/css instead of in js.

BUG=None
TEST=Tested by tick/shutter/record-start/record-end sounds.

Change-Id: Iabb70f4c38153913504d45c12d21c961177ec5af
Reviewed-on: https://chromium-review.googlesource.com/c/1461956
Reviewed-by: Sheng-hao Tsao <shenghao@google.com>
Commit-Queue: yuli <yuli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#631168}
6 files changed