Implement a non-recursive PrePaint treewalk

Implement a non-recursive PrePaint treewalk

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

[pdr., 2017-03-07 06:10:17]

Description was changed from

==========
Implement a non-recursive PrePaint treewalk

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

to

==========
Implement a non-recursive PrePaint treewalk

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

[pdr., 2017-03-07 06:10:29]

Description was changed from

==========
Implement a non-recursive PrePaint treewalk

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

to

==========
Implement a non-recursive PrePaint treewalk

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

[pdr., 2017-03-07 06:10:36]

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

[commit-bot: I haz the power, 2017-03-07 06:11:29]

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

[pdr., 2017-03-07 06:28:15]

Description was changed from

==========
Implement a non-recursive PrePaint treewalk

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

to

==========
Implement a non-recursive PrePaint treewalk

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

[pdr., 2017-03-07 06:36:12]

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

[commit-bot: I haz the power, 2017-03-07 06:36:58]

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, 2017-03-07 07:50:15]

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

[commit-bot: I haz the power, 2017-03-07 07:50:16]

Dry run: Try jobs failed on following builders:
  win_chromium_x64_rel_ng on master.tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)

[pdr., 2017-03-08 01:04:59]

https://codereview.chromium.org/2735823005/diff/40001/third_party/WebKit/Sour...
File third_party/WebKit/Source/core/paint/PrePaintTreeWalk.cpp (right):

https://codereview.chromium.org/2735823005/diff/40001/third_party/WebKit/Sour...
third_party/WebKit/Source/core/paint/PrePaintTreeWalk.cpp:88:
Vector<PrePaintTreeWalkContext> stack;
This has a bug: when the vector resizes, parent pointers in
PrePaintTreeWalkContext.paintInvalidatorContext are no longer valid. This should
use a linked list instead.