Update PaintLayer::needsPaintPhaseXXX flags when add/remove layer on style change

Update PaintLayer::needsPaintPhaseXXX flags when add/remove layer on style change

When addding/removing a layer on style change, we may not
do paint invalidation to update the needsPaintPhaseXXX flags, so
we need to update the flags manually.

In the future, the logic can be simplified by updating the flags
during pre-painting tree walk.

BUG=598978
Review URL: https://codereview.chromium.org/1862313002

Cr-Commit-Position: refs/heads/master@{#386264}

[Xianzhu, 2016-04-11 23:17:45]

Committed patchset #1 (id:1) to pending queue manually as
e18b750ff0b6bde3e4d74a6924e2b587f525a87f.