Added toString to SkXfermode-derived classes (for debugger) 

https://codereview.appspot.com/7139058/



git-svn-id: http://skia.googlecode.com/svn/trunk@7308 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/effects/SkPixelXorXfermode.h b/include/effects/SkPixelXorXfermode.h
index b01f3c5..5411b12 100644
--- a/include/effects/SkPixelXorXfermode.h
+++ b/include/effects/SkPixelXorXfermode.h
@@ -19,6 +19,7 @@
 public:
     SkPixelXorXfermode(SkColor opColor) : fOpColor(opColor) {}
 
+    SK_DEVELOPER_TO_STRING()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkPixelXorXfermode)
 
 protected: