Sam Atkins 2ed0f880ee LibWeb: Add TokenStream::rewind_to_position() ...

Parsing media queries sometimes requires significant back-tracking, so
`reconsume_current_input_token()` was not good enough.
`rewind_to_position()` lets you reconsume an erbitrary number of tokens
to return to an earlier point in the stream, which you previously saved
from `TokenStream::position()`.

2021-10-01 20:03:03 +02:00

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