
Allow overriding of the creation of the dragger in goog.ui.Dialog so subclasses can control what is draggable.

R=gboyer
DELTA=10  (0 added, 0 deleted, 10 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=1949


git-svn-id: 35241bd708fe29f1f6c7a4322d322e99ff93b95e@936 0b95b8e8-c90f-11de-9d4f-f947ee5921c8

mdavid/closure-library,mdavid/closure-library,mdavid/closure-library