Merge "profcollect: trace on background thread" am: f8eb7b136c am: d353c81c5c am: e54991b72d

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1894997

Change-Id: Ia46baedbb5d3ab6210002c1ade00f4c6d8cc1e19