Sync with dee9d51
Sync with dee9d51

Synced with dart-lang/site-webdev master branch, commit dee9d51:
https://github.com/dart-lang/site-webdev/tree/dee9d514950113bd176829b393fd09c361bd7f3c/examples/ng/doc/structural-directives

googlearchive/structural-directives,angular-examples/structural-directives,googlearchive/structural-directives,angular-examples/structural-directives