Make GrCircleBlurFragmentProcessor::onIsEqual include the position

src/effects/GrCircleBlurFragmentProcessor.h

Index: src/effects/GrCircleBlurFragmentProcessor.h
diff --git a/src/effects/GrCircleBlurFragmentProcessor.h b/src/effects/GrCircleBlurFragmentProcessor.h
index 999596eb2c1dde3819c474b8ff28697e77261f02..2a97646ff5d7e118f5636115b5d93156565d385b 100644
--- a/src/effects/GrCircleBlurFragmentProcessor.h
+++ b/src/effects/GrCircleBlurFragmentProcessor.h
@@ -64,7 +64,7 @@ private:
     bool onIsEqual(const GrFragmentProcessor& other) const override {
         const GrCircleBlurFragmentProcessor& cbfp = other.cast<GrCircleBlurFragmentProcessor>();
         // fOffset is computed from the circle width and the sigma
-        return this->circle().width() == cbfp.circle().width() && fSigma == cbfp.fSigma;    
+        return this->circle() == cbfp.circle() && fSigma == cbfp.fSigma;
     }
 
     void onComputeInvariantOutput(GrInvariantOutput* inout) const override;