Remove several entries from invocation fuzzer blacklist.

Add event loop, isolate startup, and symbol helper functions to the invisible list.

Include doubles as a target.

BUG=http://dartbug.com/15274
BUG=http://dartbug.com/20583
BUG=http://dartbug.com/21707
R=regis@google.com

Review URL: https://codereview.chromium.org//775223002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42092 260f80e4-7a28-3924-810f-c04153c831b5
Rework the whitespace/comment change detection.

R=brianwilkerson@google.com
BUG=

Review URL: https://codereview.chromium.org//774153006

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42093 260f80e4-7a28-3924-810f-c04153c831b5
Don't throw an exception when model is changed.

I don't add much information, just 'return false;' is enough.

R=brianwilkerson@google.com
BUG=

Review URL: https://codereview.chromium.org//770613003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42094 260f80e4-7a28-3924-810f-c04153c831b5