Remove unneeded GrGLSLTransformedCoordsArray type

Rename GrGLSLFragmentBuilder::ensureFSCoords2D to ensureCoords2D and make it take an arbitrary GrShaderVar.
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2324663004

Review-Url: https://codereview.chromium.org/2324663004
diff --git a/experimental/SkPerlinNoiseShader2/SkPerlinNoiseShader2.cpp b/experimental/SkPerlinNoiseShader2/SkPerlinNoiseShader2.cpp
index cfea408..2c2f65e 100644
--- a/experimental/SkPerlinNoiseShader2/SkPerlinNoiseShader2.cpp
+++ b/experimental/SkPerlinNoiseShader2/SkPerlinNoiseShader2.cpp
@@ -739,7 +739,7 @@
 
     GrGLSLFragmentBuilder* fsBuilder = args.fFragBuilder;
     GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
-    SkString vCoords = fsBuilder->ensureFSCoords2D(args.fCoords, 0);
+    SkString vCoords = fsBuilder->ensureCoords2D(args.fTransformedCoords[0]);
 
     fBaseFrequencyUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
                                                    kVec2f_GrSLType, kDefault_GrSLPrecision,
@@ -1145,7 +1145,7 @@
 void GrGLImprovedPerlinNoise::emitCode(EmitArgs& args) {
     GrGLSLFragmentBuilder* fsBuilder = args.fFragBuilder;
     GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
-    SkString vCoords = fsBuilder->ensureFSCoords2D(args.fCoords, 0);
+    SkString vCoords = fsBuilder->ensureCoords2D(args.fTransformedCoords[0]);
 
     fBaseFrequencyUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
                                                    kVec2f_GrSLType, kDefault_GrSLPrecision,