Sync with a8a83b9
Sync with a8a83b9

Synced with dart-lang/site-webdev 5-dev branch, commit a8a83b9:
https://github.com/dart-lang/site-webdev/tree/a8a83b943e082bc6e3e418d2f0a0460159fe4b00/examples/ng/doc/server-communication

googlearchive/server-communication,angular-examples/server-communication,angular-examples/server-communication,googlearchive/server-communication