Return "auto" for computed z-index on non-stacking-context element

Return "auto" for computed z-index on non-stacking-context element

Following https://codereview.chromium.org/2047283002 we were returning
"0" for getComputedStyle(element).zIndex for elements that were not
stacking contexts. Previously we would return "auto". Both behaviours
are incorrect.

This patch reverts the change in getComputedStyle() behaviour back
to "auto".

BUG=656681
Committed: https://crrev.com/664d4716b91e01c779a77702e9f219c2744724e0
Cr-Commit-Position: refs/heads/master@{#426690}

[alancutter (OOO until 2018), 2016-10-20 03:27:54]

Description was changed from

==========
Return "auto" computed z-index for non-stacking-context element

Following https://codereview.chromium.org/2047283002 we were returning
"0" for getComputedStyle(element).zIndex for elements that were not
stacking contexts. Previously we would return "auto". Both behaviours
are incorrect.

This patch reverts the change in behaviour back to "auto".

BUG=656681
==========

to

==========
Return "auto" for computed z-index on non-stacking-context element

Following https://codereview.chromium.org/2047283002 we were returning
"0" for getComputedStyle(element).zIndex for elements that were not
stacking contexts. Previously we would return "auto". Both behaviours
are incorrect.

This patch reverts the change in behaviour back to "auto".

BUG=656681
==========

[alancutter (OOO until 2018), 2016-10-20 03:27:54]

alancutter@chromium.org changed reviewers:
+ timloh@chromium.org

[alancutter (OOO until 2018), 2016-10-20 03:28:17]

Description was changed from

==========
Return "auto" for computed z-index on non-stacking-context element

Following https://codereview.chromium.org/2047283002 we were returning
"0" for getComputedStyle(element).zIndex for elements that were not
stacking contexts. Previously we would return "auto". Both behaviours
are incorrect.

This patch reverts the change in behaviour back to "auto".

BUG=656681
==========

to

==========
Return "auto" for computed z-index on non-stacking-context element

Following https://codereview.chromium.org/2047283002 we were returning
"0" for getComputedStyle(element).zIndex for elements that were not
stacking contexts. Previously we would return "auto". Both behaviours
are incorrect.

This patch reverts the change in getComputedStyle() behaviour back
to "auto".

BUG=656681
==========

[alancutter (OOO until 2018), 2016-10-20 03:29:25]

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

[commit-bot: I haz the power, 2016-10-20 03:30:05]

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, 2016-10-20 04:57:29]

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

[commit-bot: I haz the power, 2016-10-20 04:57:29]

Dry run: This issue passed the CQ dry run.

[rune, 2016-10-20 07:25:47]

rune@opera.com changed reviewers:
+ rune@opera.com

[rune, 2016-10-20 07:25:47]

lgtm

[alancutter (OOO until 2018), 2016-10-21 02:05:43]

The CQ bit was checked by alancutter@chromium.org

[commit-bot: I haz the power, 2016-10-21 02:06:24]

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, 2016-10-21 02:19:20]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-21 13:26:08]

Description was changed from

==========
Return "auto" for computed z-index on non-stacking-context element

Following https://codereview.chromium.org/2047283002 we were returning
"0" for getComputedStyle(element).zIndex for elements that were not
stacking contexts. Previously we would return "auto". Both behaviours
are incorrect.

This patch reverts the change in getComputedStyle() behaviour back
to "auto".

BUG=656681
==========

to

==========
Return "auto" for computed z-index on non-stacking-context element

Following https://codereview.chromium.org/2047283002 we were returning
"0" for getComputedStyle(element).zIndex for elements that were not
stacking contexts. Previously we would return "auto". Both behaviours
are incorrect.

This patch reverts the change in getComputedStyle() behaviour back
to "auto".

BUG=656681

Committed: https://crrev.com/664d4716b91e01c779a77702e9f219c2744724e0
Cr-Commit-Position: refs/heads/master@{#426690}
==========

[commit-bot: I haz the power, 2016-10-21 13:26:08]

Patchset 1 (id:??) landed as
https://crrev.com/664d4716b91e01c779a77702e9f219c2744724e0
Cr-Commit-Position: refs/heads/master@{#426690}