Only increase the hotness for UI thread after startup.

To avoid JITting adding startup overhead.

Test: test.py
Test: Compose app, jank doesn't regress

Bug: 333701031
Bug: 348349227
(cherry picked from https://android-review.googlesource.com/q/commit:50a7c38d0ec0c8e2817e782ef7f52e6f670ccb33)
Merged-In: I07460ed32b8365d7517f2d76beb08314ef8cc293
Change-Id: I07460ed32b8365d7517f2d76beb08314ef8cc293
1 file changed