Add Lua SkXfermode skp scraping support

include/core/SkXfermode.h

Index: include/core/SkXfermode.h
diff --git a/include/core/SkXfermode.h b/include/core/SkXfermode.h
index 91268ab5f127a5ec37cf8102b4c8dafe27706839..748c271aeb3c4e38a6d48981daa1c2665acfdc6d 100644
--- a/include/core/SkXfermode.h
+++ b/include/core/SkXfermode.h
@@ -12,6 +12,7 @@
 
 #include "SkFlattenable.h"
 #include "SkColor.h"
+#include "SkString.h"
 
 class GrFragmentProcessor;
 class GrTexture;
@@ -241,6 +242,12 @@ protected:
     */
     virtual SkPMColor xferColor(SkPMColor src, SkPMColor dst) const;
 
+    /**
+     *  luaGetName should only be used for lua-based .skp scraping.
+     */
+    friend class SkLuaAccess;
+    virtual void luaGetName(SkString* name) const { name->set("Unknown"); }

[reed1, 2016/01/21 14:39:11]

can this be private?

+
 private:
     enum {
         kModeCount = kLastMode + 1