e9461777dd
Useful for measuring performance, stress testing, and memory leak detection. R=johnniwinther@google.com Review URL: https://codereview.chromium.org//548293002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@39961 260f80e4-7a28-3924-810f-c04153c831b5