Bump wait time for watcher test.
Bump wait time for watcher test.

This is to see if it makes the test less flaky on the bots,
in particular the ARM ones.

BUG=https://code.google.com/p/dart/issues/detail?id=13705
R=nweiz@google.com

Review URL: https://codereview.chromium.org//26398002

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@28341 260f80e4-7a28-3924-810f-c04153c831b5

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