fix broadcast streams

BUG=
R=paulberry@google.com

Review URL: https://codereview.chromium.org//752193002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41940 260f80e4-7a28-3924-810f-c04153c831b5
pkg/shelf: handle errors when parsing HttpRequest in shelf_io

BUG= https://code.google.com/p/dart/issues/detail?id=19985
R=nweiz@google.com

Review URL: https://codereview.chromium.org//654933005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41941 260f80e4-7a28-3924-810f-c04153c831b5
Incremental improvements in parameters and types matching.

R=brianwilkerson@google.com
BUG=

Review URL: https://codereview.chromium.org//755743002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41942 260f80e4-7a28-3924-810f-c04153c831b5