Rename GrDrawOp::xpRequiresDstTexture to finalize and change return type to an enum

Bug: skia:
Change-Id: I0f9d9d3ef1dd20821f171f7d6237491921fbbd97
Reviewed-on: https://skia-review.googlesource.com/20142
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
diff --git a/src/gpu/ops/GrAAFillRectOp.cpp b/src/gpu/ops/GrAAFillRectOp.cpp
index db856b2..30023f3 100644
--- a/src/gpu/ops/GrAAFillRectOp.cpp
+++ b/src/gpu/ops/GrAAFillRectOp.cpp
@@ -219,9 +219,9 @@
 
     FixedFunctionFlags fixedFunctionFlags() const override { return fHelper.fixedFunctionFlags(); }
 
-    bool xpRequiresDstTexture(const GrCaps& caps, const GrAppliedClip* clip) override {
+    RequiresDstTexture finalize(const GrCaps& caps, const GrAppliedClip* clip) override {
         GrColor color = this->first()->color();
-        bool result = fHelper.xpRequiresDstTexture(
+        auto result = fHelper.xpRequiresDstTexture(
                 caps, clip, GrProcessorAnalysisCoverage::kSingleChannel, &color);
         this->first()->setColor(color);
         return result;