
Fixes wonky behavior in DragListGroup due to heights being cached, but not updated correctly.

R=kai
DELTA=53  (42 added, 10 deleted, 1 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=959


yamadatomonori/closure-library,yamadatomonori/closure-library,yamadatomonori/closure-library