Rename some processor functions from GL to GLSL

src/effects/SkArithmeticMode_gpu.h

Index: src/effects/SkArithmeticMode_gpu.h
diff --git a/src/effects/SkArithmeticMode_gpu.h b/src/effects/SkArithmeticMode_gpu.h
index 2f8013ff1632b9843cefba6a91e7bb5ab9774f47..37ad49e1559fd9f8b8a22fe11ecb085bfccc544b 100644
--- a/src/effects/SkArithmeticMode_gpu.h
+++ b/src/effects/SkArithmeticMode_gpu.h
@@ -47,9 +47,9 @@ public:
     bool enforcePMColor() const { return fEnforcePMColor; }
 
 private:
-    GrGLSLFragmentProcessor* onCreateGLInstance() const override;
+    GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
 
-    void onGetGLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const override;
+    void onGetGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const override;
 
     bool onIsEqual(const GrFragmentProcessor&) const override;