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The timing changes caused by allowing transformers to return non-Futures tickled a race condition in the tests for running declaring transformers eagerly. This avoids that race condition by ensuring that the transformers are fully declared before any assets are requested. R=rnystrom@google.com BUG= Review URL: https://codereview.chromium.org//247813004 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@35283 260f80e4-7a28-3924-810f-c04153c831b5