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With https://codereview.chromium.org/196273003/, it matters less that isPrimary be as efficient as possible. This will also improve logging (see issue 17422) and make the lazy pipeline more accurate. R=rnystrom@google.com BUG=17422 Review URL: https://codereview.chromium.org//196063004 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@33620 260f80e4-7a28-3924-810f-c04153c831b5