Fix PaintPropertyTreePrinter

Fix PaintPropertyTreePrinter

Previously it printed nothing because it didn't collect the root nodes.

Committed: https://crrev.com/f070db9ec34a891c85e375827696f733db8d21c1
Cr-Commit-Position: refs/heads/master@{#406132}

[Xianzhu, 2016-07-18 21:08:42]

Description was changed from

==========
Fix PaintPropertyTreePrinter

Previously it printed nothing because it doesn't collect the root nodes.
==========

to

==========
Fix PaintPropertyTreePrinter

Previously it printed nothing because it didn't collect the root nodes.

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

[Xianzhu, 2016-07-18 21:08:49]

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

[Xianzhu, 2016-07-18 21:09:06]

wangxianzhu@chromium.org changed reviewers:
+ pdr@chromium.org

[commit-bot: I haz the power, 2016-07-18 21:09:54]

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

[chrishtr, 2016-07-18 21:32:47]

Description was changed from

==========
Fix PaintPropertyTreePrinter

Previously it printed nothing because it didn't collect the root nodes.

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

to

==========
Fix PaintPropertyTreePrinter

Previously it printed nothing because it didn't collect the root nodes.
==========

[chrishtr, 2016-07-18 21:34:48]

chrishtr@chromium.org changed reviewers:
+ chrishtr@chromium.org

[chrishtr, 2016-07-18 21:34:49]

lgtm

[commit-bot: I haz the power, 2016-07-18 22:33:20]

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

[commit-bot: I haz the power, 2016-07-18 22:33:20]

Dry run: This issue passed the CQ dry run.

[Xianzhu, 2016-07-18 22:36:50]

The CQ bit was checked by wangxianzhu@chromium.org

[commit-bot: I haz the power, 2016-07-18 22:38:08]

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, 2016-07-18 23:30:13]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-18 23:32:27]

Description was changed from

==========
Fix PaintPropertyTreePrinter

Previously it printed nothing because it didn't collect the root nodes.
==========

to

==========
Fix PaintPropertyTreePrinter

Previously it printed nothing because it didn't collect the root nodes.

Committed: https://crrev.com/f070db9ec34a891c85e375827696f733db8d21c1
Cr-Commit-Position: refs/heads/master@{#406132}
==========

[commit-bot: I haz the power, 2016-07-18 23:32:28]

Patchset 1 (id:??) landed as
https://crrev.com/f070db9ec34a891c85e375827696f733db8d21c1
Cr-Commit-Position: refs/heads/master@{#406132}