Change integration test notifications to use structured objects.

This allows us to use completions when writing code to handle server
notifications in integration tests.

R=scheglov@google.com

Review URL: https://codereview.chromium.org//631553002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@40916 260f80e4-7a28-3924-810f-c04153c831b5
Fix carry out calculation in ARM simulator.
Add a regression test.
Simplify overflow calculation in ARM simulator.

R=zra@google.com

Review URL: https://codereview.chromium.org//623823003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@40918 260f80e4-7a28-3924-810f-c04153c831b5
Document DateTime.parse accepted format.

Mention in toString and toIso8601String that the output can be
put back into parse.

Change description of format to match the corresponding format letters
used by package:intl.

BUG= http://dartbug.com/21226
R=sgjesse@google.com

Review URL: https://codereview.chromium.org//629943002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@40919 260f80e4-7a28-3924-810f-c04153c831b5