Implement support to consider <space> key as part of typeAhead searching.

Implement support to consider <space> key as part of typeAhead searching.

Blink support special handling for <space> key to open menu-list item when it
is selected. Typeahead searching in list item is reseted due to this feature.
This patch adds an implementation to check whether current typeAhead sessions
is active or not. If typeAhead session is active <space> is considered as part
of search string othrwise open menu-list. Trying to match FF/IE behavior.

BUG=473050
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=193280

[Abhijeet Kandalkar Slow, 2015-04-03 08:03:52]

abhijeet.k@samsung.com changed reviewers:
+ eae@chromium.org, vivekg@chromium.org

[Abhijeet Kandalkar Slow, 2015-04-03 08:06:44]

Please review patch.

[eae, 2015-04-03 17:13:29]

This doesn't seem like the right fix, we want space to open the menu as that
matches the expected behavior on the majority of platforms we are running on.
Wouldn't it make more sense to preserve the existing behavior _unless_
type-ahead is in progress?

[Abhijeet Kandalkar Slow, 2015-04-05 06:53:27]

On 2015/04/03 17:13:29, eae wrote:
> This doesn't seem like the right fix, we want space to open the menu as that
> matches the expected behavior on the majority of platforms we are running on.
> Wouldn't it make more sense to preserve the existing behavior _unless_
> type-ahead is in progress?

Added new function to TypeAhead implementation to check whether 
current typeAhead session is active or not.

Please review patch.

[eae, 2015-04-07 14:47:49]

Much better thank you

LGTM

[Abhijeet Kandalkar Slow, 2015-04-07 15:16:55]

The CQ bit was checked by abhijeet.k@samsung.com

[commit-bot: I haz the power, 2015-04-07 15:17:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1058243002/20001

[commit-bot: I haz the power, 2015-04-07 16:34:38]

Committed patchset #2 (id:20001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=193280