Don't require GrPipelineBuilder to build GrPipeline

Change-Id: Ic978913aa9dd0811eac102755934d77b4853a568
Reviewed-on: https://skia-review.googlesource.com/7207
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
10 files changed