Enable printing from a Worker-based isolate.
Enable printing from a Worker-based isolate.

In recent Chrome and Firefox versions, console.log is available in Workers. But in other browsers, for example, Safari, console.log isn't available.

R=johnniwinther@google.com

Review URL: https://codereview.chromium.org//343603002

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@37499 260f80e4-7a28-3924-810f-c04153c831b5

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