tools/skp_parser: add some explanitory comments

Change-Id: I38e9a392214394ac3552b05dcc6b27a1ae937e57
Reviewed-on: https://skia-review.googlesource.com/63820
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
1 file changed