Add new Dart 2 Map, Iterable, and List methods to multimap stuff#425

Merged

cbracken merged 6 commits intogoogle:masterfrom srawlins:core-libs-dart-3

Mar 23, 2018

+60-31

Commits on Mar 11, 2018

Commits on Mar 12, 2018

Commits on Mar 20, 2018

Merge branch 'master' into core-libs-dart-3
srawlins
committed

Commits on Mar 23, 2018

Merge branch 'master' into core-libs-dart-3
cbracken
authored