Set needsPaintPhaseDescendantBlockBackgrounds if a table has collapsed borders

Set needsPaintPhaseDescendantBlockBackgrounds if a table has collapsed borders

No matter the actual borders are defined by which descendants and
whether the descedants have self-painting layer, a border-collapsing
table always paint collapsed borders in
PaintPhaseDescendantBlockBackgrounds.

Set needsPaintPhaseDescendantBlockBackgrounds if a table has visible
collapsed borders.

BUG=607022
TEST=PaintLayerPainterTest.TableCollapsedBorderNeedsPaintPhaseDescendantBlockBackgrounds

Review-Url: https://codereview.chromium.org/1925703003
Cr-Commit-Position: refs/heads/master@{#390242}

Committed: https://chromium.googlesource.com/chromium/src/+/0232fd39ca56b39772db60d2f94d011389817880

[Xianzhu, 2016-04-29 05:54:03]

Description was changed from

==========
Set needsPaintPhaseDescendantBlockBackgrounds if a table has collapsed borders

No matter the actual borders are defined by which descendants and
whether the descedants have self-painting layer, a border-collapsing
table always paint collapsed borders in
PaintPhaseDescendantBlockBackgrounds.

Set needsPaintPhaseDescendantBlockBackgrounds if a table has visible
collapsed borders.

BUG=607022
TEST=PaintLayerPainterTest.TableCollapsedBorderNeedsPaintPhaseDescendantBlockBackgrounds

Review-Url: https://codereview.chromium.org/1925703003
Cr-Commit-Position: refs/heads/master@{#390242}
==========

to

==========
Set needsPaintPhaseDescendantBlockBackgrounds if a table has collapsed borders

No matter the actual borders are defined by which descendants and
whether the descedants have self-painting layer, a border-collapsing
table always paint collapsed borders in
PaintPhaseDescendantBlockBackgrounds.

Set needsPaintPhaseDescendantBlockBackgrounds if a table has visible
collapsed borders.

BUG=607022
TEST=PaintLayerPainterTest.TableCollapsedBorderNeedsPaintPhaseDescendantBlockBackgrounds

Review-Url: https://codereview.chromium.org/1925703003
Cr-Commit-Position: refs/heads/master@{#390242}

Committed:
https://chromium.googlesource.com/chromium/src/+/0232fd39ca56b39772db60d2f94d...
==========

[Xianzhu, 2016-04-29 05:54:05]

Committed patchset #1 (id:1) manually as
0232fd39ca56b39772db60d2f94d011389817880.