[4/21/16] webperf group call @ 10AM PST

*** note: this week's call is moved to Thursday ***

Dial-in details:
https://www.w3.org/wiki/Web_Performance/Call_Information#VoIP

Tentative agenda:

   - PerfObserver TAG feedback
      -
      https://github.com/w3ctag/spec-reviews/issues/18#issuecomment-203969203
      - https://github.com/w3c/performance-timeline/pull/52
      - Nav + Resource Timing tests
      - https://github.com/w3c/resource-timing/issues/46
      - https://github.com/w3c/navigation-timing/issues/39
      - Page Visibility
      - Define onvisibilitychange:
      https://github.com/w3c/page-visibility/pull/23
      - Tests for visibilitychange:
      https://github.com/w3c/page-visibility/issues/21
   - Land continuous IDL updates?
      - https://github.com/w3c/resource-timing/pull/51
      - https://github.com/w3c/navigation-timing/pull/41
      - Beacon
      - Add method to sendBeacon: https://github.com/w3c/beacon/pull/27
      - requestIdleCallback
   - Integration with Intersection & PerfObserver?