Alter SkXfermode's asFragmentProcessor & asXPFactory contracts

src/utils/debugger/SkOverdrawMode.cpp

Index: src/utils/debugger/SkOverdrawMode.cpp
diff --git a/src/utils/debugger/SkOverdrawMode.cpp b/src/utils/debugger/SkOverdrawMode.cpp
index 400e58309f0d73c327e7c79177680df4f7d307f4..895c8daf5857d03110ec351ad4897d6dde9e2acc 100644
--- a/src/utils/debugger/SkOverdrawMode.cpp
+++ b/src/utils/debugger/SkOverdrawMode.cpp
@@ -291,19 +291,12 @@ public:
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkOverdrawXfermode)
 
 #if SK_SUPPORT_GPU
-    bool asFragmentProcessor(const GrFragmentProcessor** output,
-                             const GrFragmentProcessor* dst) const override {
-        if (output) {
-            *output = GrOverdrawFP::Create(dst);
-        }
-        return true;
+    const GrFragmentProcessor* asFragmentProcessor(const GrFragmentProcessor* dst) const override {
+        return GrOverdrawFP::Create(dst);
     }
 
-    bool asXPFactory(GrXPFactory** xpf) const override {
-        if (xpf) {
-            *xpf = GrOverdrawXPFactory::Create();
-        }
-        return true;
+    GrXPFactory* asXPFactory() const override {
+        return GrOverdrawXPFactory::Create();
     }
 #endif