Load exception event
Load exception event

Dispatch load exception so that others can react without capturing the corresponding error. Will be used in conjunction with https://github.com/dart-lang/test/pull/682

Bug:
Change-Id: I19458ac01ba013cac6ad5408b3b763777e50ca4e
Reviewed-on: https://dart-review.googlesource.com/6644
Reviewed-by: Jake Macdonald <28dccc213a1e50b0de348b9cb82c0229ef6b65f0@google.com>
Commit-Queue: Gary Roumanis <d5b6b5e05b98e5bbacdd1eed49204da9b1e1f2d1@google.com>

dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk