abstract name of clipping ops, to transtion to a more restricted set

include/gpu/GrPaint.h

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef GrPaint_DEFINED
@@ skipping 81 matching lines @@
     }
 
     void setXPFactory(sk_sp<GrXPFactory> xpFactory) {
         fXPFactory = std::move(xpFactory);
     }
 
     void setPorterDuffXPFactory(SkXfermode::Mode mode) {
         fXPFactory = GrPorterDuffXPFactory::Make(mode);
     }
 
-    void setCoverageSetOpXPFactory(SkRegion::Op regionOp, bool invertCoverage = false); 
+    void setCoverageSetOpXPFactory(SkRegion::Op, bool invertCoverage = false);
 
     /**
      * Appends an additional color processor to the color computation.
      */
     void addColorFragmentProcessor(sk_sp<GrFragmentProcessor> fp) {
         SkASSERT(fp);
         fUsesDistanceVectorField |= fp->usesDistanceVectorField();
         fColorFragmentProcessors.push_back(std::move(fp));
     }
 
@@ skipping 74 matching lines @@
 
     bool                                      fAntiAlias;
     bool                                      fDisableOutputConversionToSRGB;
     bool                                      fAllowSRGBInputs;
     bool                                      fUsesDistanceVectorField;
 
     GrColor4f                                 fColor;
 };
 
 #endif