Make GrFragmentProcessor auto-compare coord xforms.

src/gpu/GrProcessor.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrProcessor.h"
 #include "GrBackendProcessorFactory.h"
 #include "GrContext.h"
@@ skipping 154 matching lines @@
     return true;
 }
 #endif // end DEBUG
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
 void GrFragmentProcessor::addCoordTransform(const GrCoordTransform* transform) {
     fCoordTransforms.push_back(transform);
     SkDEBUGCODE(transform->setInProcessor();)
 }
+
+bool GrFragmentProcessor::hasSameTransforms(const GrFragmentProcessor& that) const {
+    if (fCoordTransforms.count() != that.fCoordTransforms.count()) {
+        return false;
+    }
+    int count = fCoordTransforms.count();
+    for (int i = 0; i < count; ++i) {
+        if (*fCoordTransforms[i] != *that.fCoordTransforms[i]) {
+            return false;
+        }
+    }
+    return true;
+}