Make GrFragmentProcessor auto-compare coord xforms.

include/gpu/GrCoordTransform.h

Index: include/gpu/GrCoordTransform.h
diff --git a/include/gpu/GrCoordTransform.h b/include/gpu/GrCoordTransform.h
index db71ff11584c701ccb6c52f7f8cfd95a8b035c90..42598dd8c54474ad25f52281ef81dc2bdc539e5e 100644
--- a/include/gpu/GrCoordTransform.h
+++ b/include/gpu/GrCoordTransform.h
@@ -91,12 +91,14 @@ public:
         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; }