tree 834317bd72249c3f3469766c5279c6973c0c20b5
parent ee75acdd512c436c20285b64022831a943f28783
author Chuck Jazdzewski <chuckj@google.com> 1611708723 -0800
committer Chuck Jazdzewski <chuckj@google.com> 1611782576 -0800

Unify Composer observer map with Layout's observer map

Removes the custom observer map that was used in the Composer
in favor of the observer map produced for use by Layout. The
Layout observer map allocates more on initial use but has
fewer allocations during recomposition and has a performance
advantage especially for a large number of invalidations.

Adds a result to IdentityArraySet.remove() to indicate when an
item was removed from the set.

Adds `remove()` to IdentityScopeMap.

Test: :compose:runtime:runtime:tDUT
Change-Id: If88b740d9a91729a65bdc71eaa6d85dbd651044d