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It works by performing incremental resolution, remembering its results and then pretending that incremental resolution did not happen. Later, after the full resolution, we compare "full" result with the incremental one. If there is a problem, it is sent to the instrumentation. R=brianwilkerson@google.com, danrubel@google.com BUG= Review URL: https://codereview.chromium.org//839913002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@42710 260f80e4-7a28-3924-810f-c04153c831b5