
Update ARIA roles and states to match most recent W3C draft.
This adds new roles and states and improves the documentation but
does not change any existing enums, so no existing code should be
affected by this change.

R=pupius
DELTA=282  (247 added, 2 deleted, 33 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=162


git-svn-id: 35241bd708fe29f1f6c7a4322d322e99ff93b95e@550 0b95b8e8-c90f-11de-9d4f-f947ee5921c8

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