Remove willReadDst from GrFragmentProcessor.

include/gpu/GrXferProcessor.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrXferProcessor_DEFINED
 #define GrXferProcessor_DEFINED
 
@@ skipping 187 matching lines @@
     /**
      * Determines whether multiplying the computed per-pixel color by the pixel's fractional
      * coverage before the blend will give the correct final destination color. In general it
      * will not as coverage is applied after blending.
      */
     virtual bool canTweakAlphaForCoverage() const = 0;
 
     /**
      *  Returns true if the XP generated by this factory will read dst.
      */
-    // TODO: Currently this function must also check if the color/coverage stages read dst.
-    //       Once only XP's can read dst we can remove the ProcOptInfo's from this function.
-    virtual bool willReadDst(const GrProcOptInfo& colorPOI,
-                             const GrProcOptInfo& coveragePOI) const = 0;
+    virtual bool willReadDst() const = 0;
 
     bool isEqual(const GrXPFactory& that) const {
         if (this->classID() != that.classID()) {
             return false;
         }
         return this->onIsEqual(that);
     }
 
     /**
       * Helper for down-casting to a GrXPFactory subclass
@@ skipping 30 matching lines @@
     enum {
         kIllegalXPFClassID = 0,
     };
     static int32_t gCurrXPFClassID;
 
     typedef GrProgramElement INHERITED;
 };
 
 #endif