Improve performance of HTMLSelectElement::setActiveSelectionAnchor().

Improve performance of HTMLSelectElement::setActiveSelectionAnchor().

Do not update m_cachedStateForActiveSelection if it's a
menulist. m_cachedStateForActiveSelection is used only in listboxes.

Removing 20,000 OPTIONs: 4,787ms -> 3,772ms

BUG=620142, 624220
Committed: https://crrev.com/25445ac85b61754a12be2ccc65ddb1ef5aa96635
Cr-Commit-Position: refs/heads/master@{#402765}

[tkent, 2016-06-29 08:21:38]

tkent@chromium.org changed reviewers:
+ keishi@chromium.org

[tkent, 2016-06-29 08:21:39]

Keishi, would you review this please?

[keishi, 2016-06-29 08:35:40]

LGTM

[tkent, 2016-06-29 08:58:48]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2016-06-29 08:59:03]

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, 2016-06-29 10:03:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-29 10:05:24]

Description was changed from

==========
Improve performance of HTMLSelectElement::setActiveSelectionAnchor().

Do not update m_cachedStateForActiveSelection if it's a
menulist. m_cachedStateForActiveSelection is used only in listboxes.

Removing 20,000 OPTIONs: 4,787ms -> 3,772ms

BUG=620142, 624220
==========

to

==========
Improve performance of HTMLSelectElement::setActiveSelectionAnchor().

Do not update m_cachedStateForActiveSelection if it's a
menulist. m_cachedStateForActiveSelection is used only in listboxes.

Removing 20,000 OPTIONs: 4,787ms -> 3,772ms

BUG=620142, 624220

Committed: https://crrev.com/25445ac85b61754a12be2ccc65ddb1ef5aa96635
Cr-Commit-Position: refs/heads/master@{#402765}
==========

[commit-bot: I haz the power, 2016-06-29 10:05:25]

Patchset 1 (id:??) landed as
https://crrev.com/25445ac85b61754a12be2ccc65ddb1ef5aa96635
Cr-Commit-Position: refs/heads/master@{#402765}