Make GrFragmentProcessor auto-compare coord xforms.

include/gpu/GrCoordTransform.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrCoordTransform_DEFINED
 #define GrCoordTransform_DEFINED
 
@@ skipping 73 matching lines @@
 
     /**
      * Access the matrix for editing. Note, this must be done before adding the transform to an
      * effect, since effects are immutable.
      */
     SkMatrix* accessMatrix() {
         SkASSERT(!fInProcessor);
         return &fMatrix;
     }
 
-    bool operator== (const GrCoordTransform& other) const {
-        return fSourceCoords == other.fSourceCoords &&
-               fMatrix.cheapEqualTo(other.fMatrix) &&
-               fReverseY == other.fReverseY;
+    bool operator== (const GrCoordTransform& that) const {
+        return fSourceCoords == that.fSourceCoords &&
+               fMatrix.cheapEqualTo(that.fMatrix) &&
+               fReverseY == that.fReverseY;
     }
 
+    bool operator!= (const GrCoordTransform& that) const { return !(*this == that); }
+
     GrCoordSet sourceCoords() const { return fSourceCoords; }
     const SkMatrix& getMatrix() const { return fMatrix; }
     bool reverseY() const { return fReverseY; }
 
     /** Useful for effects that want to insert a texture matrix that is implied by the texture
         dimensions */
     static inline SkMatrix MakeDivByTextureWHMatrix(const GrTexture* texture) {
         SkASSERT(texture);
         SkMatrix mat;
         mat.setIDiv(texture->width(), texture->height());
         return mat;
     }
 
 private:
     GrCoordSet fSourceCoords;
     SkMatrix   fMatrix;
     bool       fReverseY;
 
     typedef SkNoncopyable INHERITED;
 
 #ifdef SK_DEBUG
 public:
     void setInProcessor() const { fInProcessor = true; }
 private:
     mutable bool fInProcessor;
 #endif
 };
 
 #endif