Fixed bugs to work with 0.5.7+1

BUG=

Review URL: https://chromiumcodereview.appspot.com//14690015
constrain to latest SDK

BUG=

Review URL: https://chromiumcodereview.appspot.com//15101002
Merge branch 'master' of https://github.com/dart-lang/web-ui into custom_pseudo
Integrated CL suggestions