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This change simply adds new syntax support for the functionality we currently have in the VM. - Support for library and import, import-as. - Still to do: show/hide combinators, export, library parts. Review URL: https://chromiumcodereview.appspot.com//10928121 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@12216 260f80e4-7a28-3924-810f-c04153c831b5