Revert "Revert^2 "Use the runtime's implementation for park/unpark""

This reverts commit 080525b3bd04dd972a7e4c68054dc2bc9b870ae9.

Bug: 28845097

Reason for revert: ThreadStress flake

Change-Id: Idd71edb5ab739f5fc0495e80ae79486bd2d8fe74
3 files changed