[SPv2] Separate SVG root viewport clip from overflow clip.

[SPv2] Separate SVG root viewport clip from overflow clip.

This will allow us to apply different clipping behavior in PaintLayerClipper
for those two types of clips, which is necessary because PaintLayerPainter should
apply overflow clip for a fragment's foregroundRect, but not the SVG root viewport
clip (the latter does not include box decoration bounds of the fragment, for
example, so applying it will cut off box decorations such as border).

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

[chrishtr, 2016-09-24 21:46:23]

Description was changed from

==========
none

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

to

==========
none

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

[chrishtr, 2016-09-24 21:49:13]

Description was changed from

==========
none

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

to

==========
[SPv2] Separate SVG root viewport clip from overflow clip.

This will allow us to apply different clipping behavior in PaintLayerClipper
for those two types of clips, which is necessary because PaintLayerPainter
should
apply overflow clip for a fragment's foregroundRect, but not the SVG root
viewport
clip (the latter does not include box decoration bounds of the fragment, for
example, so applying it will cut off box decorations such as border).

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

[chrishtr, 2016-09-24 21:49:19]

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

[commit-bot: I haz the power, 2016-09-24 21:49:29]

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, 2016-09-24 22:20:04]

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

[commit-bot: I haz the power, 2016-09-24 22:20:05]

Dry run: Try jobs failed on following builders:
  linux_layout_tests_slimming_paint_v2 on master.tryserver.chromium.linux
(JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_layout_te...)

[chrishtr, 2016-09-26 17:35:27]

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

[commit-bot: I haz the power, 2016-09-26 17:35:51]

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

[chrishtr, 2016-09-26 17:48:44]

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

[chrishtr, 2016-09-26 17:48:49]

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

[commit-bot: I haz the power, 2016-09-26 17:49:37]

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, 2016-09-26 19:10:15]

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

[commit-bot: I haz the power, 2016-09-26 19:10:16]

Dry run: Try jobs failed on following builders:
  linux_layout_tests_slimming_paint_v2 on master.tryserver.chromium.linux
(JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_layout_te...)