Reimplement deserialization of SkImageFilter's uniqueID.

include/effects/SkXfermodeImageFilter.h

Index: include/effects/SkXfermodeImageFilter.h
diff --git a/include/effects/SkXfermodeImageFilter.h b/include/effects/SkXfermodeImageFilter.h
index 7c29e28e8a9f9792692406f5e5d29899cb6863f6..6736889ac8ed4d8cf9faf7a062d5094b02ce98d4 100644
--- a/include/effects/SkXfermodeImageFilter.h
+++ b/include/effects/SkXfermodeImageFilter.h
@@ -25,9 +25,10 @@ public:
 
     static SkXfermodeImageFilter* Create(SkXfermode* mode, SkImageFilter* background,
                                          SkImageFilter* foreground = NULL,
-                                         const CropRect* cropRect = NULL) {
+                                         const CropRect* cropRect = NULL,
+                                         uint32_t uniqueID = 0) {
         SkImageFilter* inputs[2] = { background, foreground };
-        return SkNEW_ARGS(SkXfermodeImageFilter, (mode, inputs, cropRect));
+        return SkNEW_ARGS(SkXfermodeImageFilter, (mode, inputs, cropRect, uniqueID));
     }
 
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkXfermodeImageFilter)
@@ -45,7 +46,7 @@ public:
 
 protected:
     SkXfermodeImageFilter(SkXfermode* mode, SkImageFilter* inputs[2],
-                          const CropRect* cropRect);
+                          const CropRect* cropRect, uint32_t uniqueID);
 #ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
     explicit SkXfermodeImageFilter(SkReadBuffer& buffer);
 #endif