Add XferProcessor factory in GrPaint and GrDrawState.

src/gpu/GrProcessor.cpp

Index: src/gpu/GrProcessor.cpp
diff --git a/src/gpu/GrProcessor.cpp b/src/gpu/GrProcessor.cpp
index d850d6894a3782e04e827d723edb2110cac05abb..8aeef04b48e8dcd1244bbd37c172baf1f80d4df0 100644
--- a/src/gpu/GrProcessor.cpp
+++ b/src/gpu/GrProcessor.cpp
@@ -28,6 +28,13 @@ GrProcessorTestFactory<GrFragmentProcessor>::GetFactories() {
 }
 
 template<>
+SkTArray<GrProcessorTestFactory<GrXferProcessor>*, true>*
+GrProcessorTestFactory<GrXferProcessor>::GetFactories() {
+    static SkTArray<GrProcessorTestFactory<GrXferProcessor>*, true> gFactories;
+    return &gFactories;
+}
+
+template<>
 SkTArray<GrProcessorTestFactory<GrGeometryProcessor>*, true>*
 GrProcessorTestFactory<GrGeometryProcessor>::GetFactories() {
     static SkTArray<GrProcessorTestFactory<GrGeometryProcessor>*, true> gFactories;
@@ -41,6 +48,7 @@ GrProcessorTestFactory<GrGeometryProcessor>::GetFactories() {
  */
 static const int kFPFactoryCount = 37;
 static const int kGPFactoryCount = 14;
+static const int kXPFactoryCount = 0;
 
 template<>
 void GrProcessorTestFactory<GrFragmentProcessor>::VerifyFactoryCount() {
@@ -56,6 +64,13 @@ void GrProcessorTestFactory<GrGeometryProcessor>::VerifyFactoryCount() {
     }
 }
 
+template<>
+void GrProcessorTestFactory<GrXferProcessor>::VerifyFactoryCount() {
+    if (kXPFactoryCount != GetFactories()->count()) {
+        SkFAIL("Wrong number of xfer processor factories!");
+    }
+}
+
 #endif
 
 namespace GrProcessorUnitTest {