Add processor info dumping to non-legacy mesh draw ops

Change-Id: I2ee77f0971a1b627905ac547bc0511042c40ac38
Reviewed-on: https://skia-review.googlesource.com/19816
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/GrProcessorSet.h b/src/gpu/GrProcessorSet.h
index d7ceced..407d71e 100644
--- a/src/gpu/GrProcessorSet.h
+++ b/src/gpu/GrProcessorSet.h
@@ -135,6 +135,8 @@
     static const GrProcessorSet& EmptySet();
     static constexpr const Analysis EmptySetAnalysis() { return Analysis(Empty::kEmpty); }
 
+    SkString dumpProcessors() const;
+
 private:
     GrProcessorSet(Empty) : fXP((const GrXferProcessor*)nullptr), fFlags(kFinalized_Flag) {}