SkPDF: GradientShaderPatterns use one hashmap not two.

Change-Id: Icdebaf891884aa06bdc36ed930d7bab5400bd04f
Reviewed-on: https://skia-review.googlesource.com/21529
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
2 files changed