Changed EListStylePosition to an enum class and renamed its members to keywords

Changed EListStylePosition to an enum class and renamed its members to keywords

Changed EListStylePosition to an enum class and gave it an unsigned underlying
type so it can be stored in a bitfield in the future. Also renamed its
members to match its keywords from CSSValueKeywords.in. This is pre-work
to move EListStylePosition to be generated in ComputedStyleBase.

BUG=628043
Committed: https://crrev.com/063379e6b1aa01de3f305c5343925d9d926e8cd0
Cr-Commit-Position: refs/heads/master@{#423038}

[sashab, 2016-09-30 04:05:36]

sashab@chromium.org changed reviewers:
+ meade@chromium.org

[meade_UTC10, 2016-09-30 05:58:05]

lgtm

[rune, 2016-09-30 09:52:51]

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

[rune, 2016-09-30 09:52:51]

lgtm

[sashab, 2016-10-04 23:52:23]

The CQ bit was checked by sashab@chromium.org

[sashab, 2016-10-04 23:52:24]

The patchset sent to the CQ was uploaded after l-g-t-m from meade@chromium.org,
rune@opera.com
Link to the patchset: https://codereview.chromium.org/2380233002/#ps20001
(title: "Rebase")

[commit-bot: I haz the power, 2016-10-04 23:52:54]

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, 2016-10-05 01:26:58]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-10-05 01:28:46]

Description was changed from

==========
Changed EListStylePosition to an enum class and renamed its members to keywords

Changed EListStylePosition to an enum class and gave it an unsigned underlying
type so it can be stored in a bitfield in the future. Also renamed its
members to match its keywords from CSSValueKeywords.in. This is pre-work
to move EListStylePosition to be generated in ComputedStyleBase.

BUG=628043
==========

to

==========
Changed EListStylePosition to an enum class and renamed its members to keywords

Changed EListStylePosition to an enum class and gave it an unsigned underlying
type so it can be stored in a bitfield in the future. Also renamed its
members to match its keywords from CSSValueKeywords.in. This is pre-work
to move EListStylePosition to be generated in ComputedStyleBase.

BUG=628043

Committed: https://crrev.com/063379e6b1aa01de3f305c5343925d9d926e8cd0
Cr-Commit-Position: refs/heads/master@{#423038}
==========

[commit-bot: I haz the power, 2016-10-05 01:28:48]

Patchset 2 (id:??) landed as
https://crrev.com/063379e6b1aa01de3f305c5343925d9d926e8cd0
Cr-Commit-Position: refs/heads/master@{#423038}