Revert "Remove opaque check in preparing dirty region"

This reverts commit 3f82a2f69719e01b5653d3b6ac362c1e82dd0043.
Revert "Speed up notification pullup & pulldown"

This reverts commit 63ef97c8d4d0db30d70621207c9e0faa4ba6bcfb.
Revert "ActivityManagerService: stay away from zombie content providers"

This reverts commit 65fafd8f618b5ffbea85715ab64b070227e0c70e.
Revert "Avoid possible memory leaks by ensuring stream closures"

This reverts commit be9f12f20cbeb393bfb1f3746ceb3aa13384fcc7.
Revert "memoize activity manager graphics acceleration check"

This reverts commit 4099dde20c18746437afc198f833f0425b39cc59.
lol