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If a transform had that asset as its primary input, it would go into an error state. R=rnystrom@google.com Review URL: https://codereview.chromium.org//19473002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@25116 260f80e4-7a28-3924-810f-c04153c831b5