reduced number of string copies in SkSL parser

Bug: skia:
Change-Id: Iab823b01b6f5f85bbb47c4ac69c6ce396dabf497
Reviewed-on: https://skia-review.googlesource.com/34000
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
2 files changed