Do more cleanup from xp changes

src/core/SkXfermode.cpp

Index: src/core/SkXfermode.cpp
diff --git a/src/core/SkXfermode.cpp b/src/core/SkXfermode.cpp
index 37dbd0d1e24a264864873e2315b9e3e6b69dc19a..1b28d1e147b911e746afaa02841c44f4fb99ffef 100644
--- a/src/core/SkXfermode.cpp
+++ b/src/core/SkXfermode.cpp
@@ -687,30 +687,30 @@ bool SkXfermode::asXPFactory(GrXPFactory**) const {
 #if SK_SUPPORT_GPU
 #include "effects/GrPorterDuffXferProcessor.h"
 
-bool SkXfermode::AsFragmentProcessorOrXPFactory(SkXfermode* xfermode,
-                                                GrFragmentProcessor** fp,
-                                                GrXPFactory** xpf) {
+bool SkXfermode::AsXPFactory(SkXfermode* xfermode, GrXPFactory** xpf) {
     Coeff src, dst;
     Mode mode;
     if (NULL == xfermode) {
-        *xpf = GrPorterDuffXPFactory::Create(kSrcOver_Mode);
+        if (xpf) {
+            *xpf = GrPorterDuffXPFactory::Create(kSrcOver_Mode);
+        }
         return true;
     } else if (xfermode->asMode(&mode) && mode <= kLastCoeffMode) {
-        *xpf = GrPorterDuffXPFactory::Create(mode);
+        if (xpf) {
+            *xpf = GrPorterDuffXPFactory::Create(mode);
+        }
         return true;
     } else if (xfermode->asCoeff(&src, &dst)) {
-        *xpf = GrPorterDuffXPFactory::Create(src, dst);
-        return true;
-    } else if (xfermode->asXPFactory(xpf)) {
+        if (xpf) {
+            *xpf = GrPorterDuffXPFactory::Create(src, dst);
+        }
         return true;
     } else {
-        return xfermode->asFragmentProcessor(fp, NULL);
+        return xfermode->asXPFactory(xpf);
     }
 }
 #else
-bool SkXfermode::AsFragmentProcessorOrXPFactory(SkXfermode* xfermode,
-                                                GrFragmentProcessor** fp,
-                                                GrXPFactory** xpf) {
+bool SkXfermode::AsXPFactory(SkXfermode* xfermode, GrXPFactory** xpf) {
     return false;
 }
 #endif