Stop flattening GrCoordTransforms in parent GrFragmentProcessors.

src/gpu/glsl/GrGLSLPrimitiveProcessor.cpp

Index: src/gpu/glsl/GrGLSLPrimitiveProcessor.cpp
diff --git a/src/gpu/glsl/GrGLSLPrimitiveProcessor.cpp b/src/gpu/glsl/GrGLSLPrimitiveProcessor.cpp
index c19239a5d54c3a3904e8026dc9dcdabd14a42379..5ae28a0bbc50012f6727a74471f0c30f71e237b3 100644
--- a/src/gpu/glsl/GrGLSLPrimitiveProcessor.cpp
+++ b/src/gpu/glsl/GrGLSLPrimitiveProcessor.cpp
@@ -47,3 +47,16 @@ void GrGLSLPrimitiveProcessor::setupUniformColor(GrGLSLPPFragmentBuilder* fragBu
                                                &stagedLocalVarName);
     fragBuilder->codeAppendf("%s = %s;", outputName, stagedLocalVarName);
 }
+
+//////////////////////////////////////////////////////////////////////////////
+
+const GrCoordTransform* GrGLSLPrimitiveProcessor::FPCoordTransformHandler::nextCoordTransform() {
+#ifdef SK_DEBUG
+    SkASSERT(nullptr == fCurr || fAddedCoord);
+    fAddedCoord = false;
+    fCurr = fIter.next();
+    return fCurr;
+#else
+    return fIter.next();
+#endif
+}