UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.101 Safari/537.36

Example URL:
http://webaudiodemos.appspot.com/metronome/index.html

Steps to reproduce the problem:
1. Open the url
2. Switch to another tab

What is the expected behavior?
The metronome should keeping playing normally just like it did when the tab was in focus. 

This works in Firefox and Safari. 

What went wrong?
The sound of the metronome can only be heard approximately once a second because the Web Audio events are not being scheduled accurately while in a background tab.

Did this work before? Yes 53.0.2785.101

Is it a problem with Flash or HTML5? HTML5

Does this work in other browsers? Yes 

Chrome version: 55.0.2858.0  Channel: canary
OS Version: OS X 10.11.6
Flash Version: Shockwave Flash 23.0 r0

Web Audio scheduling in a background tab which is possible using Web Workers in the current Chrome, is now throttled when in a background tab in Canary (v55). Background tab Web Audio is a beautiful thing and opens up all kinds of musical possibilities for generative and ambient music that someone can listen to all day, but we can't expect someone to keep one tab in focus all day.