Make GrFragmentProcessor auto-compare coord xforms.

src/gpu/GrProcessor.cpp

Index: src/gpu/GrProcessor.cpp
diff --git a/src/gpu/GrProcessor.cpp b/src/gpu/GrProcessor.cpp
index 4e171fc99b0faf3ff93e8f35f3e6be1bb109b1ec..da27abb4a95d4c16271af734bc2555edcb8f7cbf 100644
--- a/src/gpu/GrProcessor.cpp
+++ b/src/gpu/GrProcessor.cpp
@@ -172,3 +172,16 @@ 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;
+}