Stop flattening GrCoordTransforms in parent GrFragmentProcessors.

src/gpu/glsl/GrGLSLPrimitiveProcessor.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLSLPrimitiveProcessor.h"
 
 #include "GrCoordTransform.h"
@@ skipping 29 matching lines @@
                                                  UniformHandle* colorUniform) {
     SkASSERT(colorUniform);
     const char* stagedLocalVarName;
     *colorUniform = uniformHandler->addUniform(kFragment_GrShaderFlag,
                                                kVec4f_GrSLType,
                                                kDefault_GrSLPrecision,
                                                "Color",
                                                &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
+}