WIP: Prune the prepaint tree walk

WIP: Prune the prepaint tree walk

This is a proof of concept of pruning the prepaint tree walk
when no property or invalidation updates are needed.

perf results: http://imgur.com/a/xAQt1

BUG=
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

[pdr., 2016-11-20 04:17:01]

Description was changed from

==========
WIP: Prune the prepaint tree walk

checkpoint


reomve debug prints


fixup release build


fix frame crossing bug


First pass with mostly working


first bits working

BUG=
==========

to

==========
WIP: Prune the prepaint tree walk

checkpoint


reomve debug prints


fixup release build


fix frame crossing bug


First pass with mostly working


first bits working

BUG=
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
==========

[pdr., 2016-11-21 19:00:23]

Description was changed from

==========
WIP: Prune the prepaint tree walk

checkpoint


reomve debug prints


fixup release build


fix frame crossing bug


First pass with mostly working


first bits working

BUG=
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
==========

to

==========
WIP: Prune the prepaint tree walk

This is a proof of concept of pruning the prepaint tree walk
when no property or invalidation updates are needed.

BUG=
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
==========

[pdr., 2016-11-21 21:16:32]

Description was changed from

==========
WIP: Prune the prepaint tree walk

This is a proof of concept of pruning the prepaint tree walk
when no property or invalidation updates are needed.

BUG=
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
==========

to

==========
WIP: Prune the prepaint tree walk

This is a proof of concept of pruning the prepaint tree walk
when no property or invalidation updates are needed.

perf results: http://imgur.com/a/xAQt1

BUG=
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
==========

[pdr., 2016-11-22 04:24:20]

The CQ bit was checked by pdr@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-11-22 04:24:34]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-11-22 04:32:31]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-11-22 04:32:31]

Dry run: Try jobs failed on following builders:
  chromium_presubmit on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)