
Added support to allow the user to specify whether the currDragItem
should stay displayed even if we do not hover over a draglist.
The default behavior is still to set the display to none as soon as we
do not hover over a list, but this feature allows the user to override
this. This is useful if we want to display the ghost of the object in
the appropriate position.

R=elsigh,kai
DELTA=22  (20 added, 0 deleted, 2 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=155001


git-svn-id: 35241bd708fe29f1f6c7a4322d322e99ff93b95e@197 0b95b8e8-c90f-11de-9d4f-f947ee5921c8

jarib/google-closure-library,neilrahilly/closure-library,mdavid/closure-library,prop/closure-library,KgDesignes/closure-library,thinkfuse/google-closure,mdavid/closure-library,Kuniwak/google-closure-library-jsdoc,neilrahilly/closure-library,rethinkdb/google-closure-library,rethinkdb/google-closure-library,mdavid/closure-library,rethinkdb/google-closure-library,neilrahilly/closure-library,knutwalker/google-closure-library,prop/closure-library,knutwalker/google-closure-library,homer6/google-closure-library,Kuniwak/google-closure-library-jsdoc,homer6/google-closure-library,thinkfuse/google-closure,KgDesignes/closure-library,homer6/google-closure-library,prop/closure-library,thinkfuse/google-closure,KgDesignes/closure-library,jarib/google-closure-library