Rename some processor functions from GL to GLSL

TBR=bsalomon@google.com

BUG=skia:

Review URL: https://codereview.chromium.org/1443743002
diff --git a/include/gpu/GrFragmentProcessor.h b/include/gpu/GrFragmentProcessor.h
index 4284662..b0ef6b5 100644
--- a/include/gpu/GrFragmentProcessor.h
+++ b/include/gpu/GrFragmentProcessor.h
@@ -63,12 +63,12 @@
 
     ~GrFragmentProcessor() override;
 
-    GrGLSLFragmentProcessor* createGLInstance() const;
+    GrGLSLFragmentProcessor* createGLSLInstance() const;
 
-    void getGLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const {
-        this->onGetGLProcessorKey(caps, b);
+    void getGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const {
+        this->onGetGLSLProcessorKey(caps, b);
         for (int i = 0; i < fChildProcessors.count(); ++i) {
-            fChildProcessors[i]->getGLProcessorKey(caps, b);
+            fChildProcessors[i]->getGLSLProcessorKey(caps, b);
         }
     }
 
@@ -104,7 +104,8 @@
         from getFactory()).
 
         A return value of true from isEqual() should not be used to test whether the processor would
-        generate the same shader code. To test for identical code generation use getGLProcessorKey*/
+        generate the same shader code. To test for identical code generation use getGLSLProcessorKey
+     */
     bool isEqual(const GrFragmentProcessor& that, bool ignoreCoordTransforms) const;
 
     /**
@@ -166,11 +167,11 @@
     /** Returns a new instance of the appropriate *GL* implementation class
         for the given GrFragmentProcessor; caller is responsible for deleting
         the object. */
-    virtual GrGLSLFragmentProcessor* onCreateGLInstance() const = 0;
+    virtual GrGLSLFragmentProcessor* onCreateGLSLInstance() const = 0;
 
     /** Implemented using GLFragmentProcessor::GenKey as described in this class's comment. */
-    virtual void onGetGLProcessorKey(const GrGLSLCaps& caps,
-                                     GrProcessorKeyBuilder* b) const = 0;
+    virtual void onGetGLSLProcessorKey(const GrGLSLCaps& caps,
+                                       GrProcessorKeyBuilder* b) const = 0;
 
     /**
      * Subclass implements this to support isEqual(). It will only be called if it is known that