Make analysis optional to GrPipeline::init().

GrXPFactory::createXferProcessor now takes GrPipelineAnalysisColor and GrPipelineAnalysisCoverage rather than GrProcessorSet::FragmentProcessorAnalysis.

This will make it so ops do not have to retain the analysis or rerun it to create pipelines at flush time.

Change-Id: Ib28ba65de425b20c2647329275f209aec168c3df
Reviewed-on: https://skia-review.googlesource.com/10474
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
19 files changed