Pull the triangulating path renderer's unique key creation into a sub-routine

We will need to be a bit more flexible wrt making this key if the
triangulated path is to be stored in the thread-safe cache.

Bug: 1108408
Change-Id: I5aeae60fb8e542152cc75ea5244b324f05c4fb04
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/326836
Reviewed-by: Adlai Holler <adlai@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
1 file changed