http2/h2demo: add HTTP/2 with Server Push

Server Push of tiles are not always the fastest. But, it
might be good to have the sample available to demonstrate
how Push is handled by the browser.

Change-Id: I967db9693e0889a889a36ad82248acef2c6db8d4
Reviewed-by: Tom Bergan <>
Reviewed-by: Brad Fitzpatrick <>
Run-TryBot: Tom Bergan <>
TryBot-Result: Gobot Gobot <>
1 file changed