Some of these are pretty trivial, but a few really moved the needle. In
total, this cut the time in the parser by about 10% in my profiling.
The early returns from peek and checkNext are probably the biggest wins,
everything else is mostly about cutting down on string copying.
Bug: skia:
Change-Id: I3da0a0cfbc557e8cef480cb3a7d301c2b3f8802a
Reviewed-on: https://skia-review.googlesource.com/34720
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
634624a185