Rename some processor functions from GL to GLSL

TBR=bsalomon@google.com

BUG=skia:

Review URL: https://codereview.chromium.org/1443743002
diff --git a/src/effects/SkPerlinNoiseShader.cpp b/src/effects/SkPerlinNoiseShader.cpp
index 2d4ab8f..914c534 100644
--- a/src/effects/SkPerlinNoiseShader.cpp
+++ b/src/effects/SkPerlinNoiseShader.cpp
@@ -534,12 +534,12 @@
     const SkMatrix& matrix() const { return fCoordTransform.getMatrix(); }
 
 private:
-    GrGLSLFragmentProcessor* onCreateGLInstance() const override {
+    GrGLSLFragmentProcessor* onCreateGLSLInstance() const override {
         return new GrGLPerlinNoise(*this);
     }
 
-    virtual void onGetGLProcessorKey(const GrGLSLCaps& caps,
-                                     GrProcessorKeyBuilder* b) const override {
+    virtual void onGetGLSLProcessorKey(const GrGLSLCaps& caps,
+                                       GrProcessorKeyBuilder* b) const override {
         GrGLPerlinNoise::GenKey(*this, caps, b);
     }