Add a test for mixed /*@noflip*/ and /*@embed*/ CSS annotations

Given that we have entirely separate code for handling one and the
other, and given the nature of code comments stuffed inside other
structures, this isn't really obvious that they work.

And indeed, "/*@noflip*/ /*@embed*/" doesn't work (filed bug 69698).
Amazingly, all other combinations do.

Change-Id: Ie30bab251eb4abee122c783d057de4102e53d1fc
Merge "Add a test for mixed /*@noflip*/ and /*@embed*/ CSS annotations"