Sync with c458ec3
Sync with c458ec3

Synced with dart-lang/site-webdev master branch, commit c458ec3:
https://github.com/dart-lang/site-webdev/tree/c458ec306225380d4cced5828a6d8f428a0b95a8/examples/ng/doc/structural-directives

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