Delay half-float vertex color determination until Op::finalize

Bug: skia:8871
Change-Id: I873e80e2d97a32e4524c177a9b6e07b0566a02ce
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/201682
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
diff --git a/src/gpu/ops/GrDefaultPathRenderer.cpp b/src/gpu/ops/GrDefaultPathRenderer.cpp
index 57bada6..8ea4bbf 100644
--- a/src/gpu/ops/GrDefaultPathRenderer.cpp
+++ b/src/gpu/ops/GrDefaultPathRenderer.cpp
@@ -392,7 +392,9 @@
         GrProcessorAnalysisCoverage gpCoverage =
                 this->coverage() == 0xFF ? GrProcessorAnalysisCoverage::kNone
                                          : GrProcessorAnalysisCoverage::kSingleChannel;
-        return fHelper.finalizeProcessors(caps, clip, fsaaType, clampType, gpCoverage, &fColor);
+        // This Op uses uniform (not vertex) color, so doesn't need to track wide color.
+        return fHelper.finalizeProcessors(
+                caps, clip, fsaaType, clampType, gpCoverage, &fColor, nullptr);
     }
 
 private: