Fixing build with SK_IGNORE_TO_STRING defined.

Change-Id: Id7238e427e490338d1f610255774c2069cfd4879
Reviewed-on: https://skia-review.googlesource.com/117060
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
4 files changed