Switched SkSL from using raw strings back to STRINGIFY

Stringify was stripping the comments from the strings, whereas raw
strings preserve them, which led to an increase in executable
size. The only effect of this change is to strip the comments back
out.

Bug: 784880
Change-Id: Icf2f9cf522cb890179f2e481a3504e8171732705
Reviewed-on: https://skia-review.googlesource.com/72524
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
7 files changed