Use token ranges for parsing identifiers and literals.

Change-Id: Ic6af2c4012033d7f7c69181f90aa6b1b9c2b2a60
Reviewed-on: https://chromium-review.googlesource.com/c/1280224Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56648}