Do some minor pre cleanup work before converting all xfermodes to XPs.

src/core/SkXfermode.cpp

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkXfermode.h"
 #include "SkXfermode_opts_SSE2.h"
@@ skipping 686 matching lines @@
         return true;
     } else if (xfermode->asMode(&mode) && mode <= kLastCoeffMode) {
         *xpf = GrPorterDuffXPFactory::Create(mode);
         return true;
     } else if (xfermode->asCoeff(&src, &dst)) {
         *xpf = GrPorterDuffXPFactory::Create(src, dst);
         return true;
     } else if (xfermode->asXPFactory(xpf)) {
         return true;
     } else {
-        return xfermode->asFragmentProcessor(fp);
+        return xfermode->asFragmentProcessor(fp, NULL);
     }
 }
 #else
 bool SkXfermode::AsFragmentProcessorOrXPFactory(SkXfermode* xfermode,
                                                 GrFragmentProcessor** fp,
                                                 GrXPFactory** xpf) {
     return false;
 }
 #endif
 
@@ skipping 1235 matching lines @@
         } else {
             proc16 = rec.fProc16_General;
         }
     }
     return proc16;
 }
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkXfermode)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkProcCoeffXfermode)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END