Make GrProcessorTestFactory be templated on smart ptr class rather than processor class.

This is part of setting the stage for moving GrFragmentProcessor to unique_ptr ownership.

Change-Id: I2dfb4977319605d56c4debe05ff0b3dc970bb4c5
Reviewed-on: https://skia-review.googlesource.com/26141
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
5 files changed