Generaly Fixes to gpu bezier code

BUG=skia:

Change-Id: I2246aa0b2bc3327df42ca30d35020a4b878a819b
Reviewed-on: https://skia-review.googlesource.com/9555
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Chris Dalton <csmartdalton@google.com>
4 files changed