Make better use of one-letter names when minifying.

BUG=
R=sra@google.com

Review URL: https://codereview.chromium.org//723063003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41731 260f80e4-7a28-3924-810f-c04153c831b5
Fix missing <T> on Completer.future getter return type.

Update a lot of documentation.
Reduce size of TimeoutException's toString.

R=sgjesse@google.com

Review URL: https://codereview.chromium.org//730453002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41732 260f80e4-7a28-3924-810f-c04153c831b5
Also test setting input field to null via undefined.

BUG= http://dartbug/21555
R=floitsch@google.com

Review URL: https://codereview.chromium.org//704193005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41733 260f80e4-7a28-3924-810f-c04153c831b5
Update co19 status for flaky tests.

BUG=
R=ricow@google.com

Review URL: https://codereview.chromium.org//729473002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41734 260f80e4-7a28-3924-810f-c04153c831b5