tree b3e05358942dca4df825542b11e6aab7459aa654
parent 5f38ed2fa3be3fe0f5a7caeebb396a1f60f910c7
author Natalie Weizenbaum <nweiz@google.com> 1464211857 -0700
committer Natalie Weizenbaum <nweiz@google.com> 1464211857 -0700

Add top-level collection-manipulation functions.

These come from various package-specific utility library across the Dart
ecosystem.

R=lrn@google.com

Review URL: https://codereview.chromium.org//1994743003 .