Add gpu implementation of SkAvoidXfermode

src/gpu/GrProcessor.cpp

Index: src/gpu/GrProcessor.cpp
diff --git a/src/gpu/GrProcessor.cpp b/src/gpu/GrProcessor.cpp
index 52f1de75e58a9713017535aa20bdc0175e18a49d..15206c2c857ca50deaea270bbe98e4511ed8bb7c 100644
--- a/src/gpu/GrProcessor.cpp
+++ b/src/gpu/GrProcessor.cpp
@@ -48,9 +48,9 @@ GrProcessorTestFactory<GrGeometryProcessor>::GetFactories() {
  * we verify the count is as expected.  If a new factory is added, then these numbers must be
  * manually adjusted.
  */
-static const int kFPFactoryCount = 40;
+static const int kFPFactoryCount = 41;
 static const int kGPFactoryCount = 14;
-static const int kXPFactoryCount = 7;
+static const int kXPFactoryCount = 8;
 
 template<>
 void GrProcessorTestFactory<GrFragmentProcessor>::VerifyFactoryCount() {