about web font Resource validation

[techhtml]

web font resource validation

Now on days we can use //fonts.googleapis.com/earlyaccess/notosanskr.css link,
but AMP validation only allow https://fonts.googleapis.com/earlyaccess/notosanskr.css

If does not have any other reason, i think will can use //fonts.googleapis.com/earlyaccess/notosanskr.css.
Please take a look.

[aghassemi]

@techhtml AMP only loads external fonts from secure origins. Even if we supported scheme-relative, we would have still rewritten it to point to https version of the resource. For now, instead of rewriting, we require the urls to be https to be more explicit.