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}

Committed: https://chromium.googlesource.com/chromium/src/+/e921b6e5f7720bee35402813ac14707eb6028480

[Xianzhu, 2016-04-14 16:15:37]

Description was changed from

==========
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}
==========

to

==========
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}

Committed:
https://chromium.googlesource.com/chromium/src/+/e921b6e5f7720bee35402813ac14...
==========

[Xianzhu, 2016-04-14 16:15:38]

Committed patchset #2 (id:20001) manually as
e921b6e5f7720bee35402813ac14707eb6028480.