Reimplement deserialization of SkImageFilter's uniqueID.

include/effects/SkDropShadowImageFilter.h

Index: include/effects/SkDropShadowImageFilter.h
diff --git a/include/effects/SkDropShadowImageFilter.h b/include/effects/SkDropShadowImageFilter.h
index 85f4afd2a0b908211810308eab9aa2e1e96ac579..0d6c24e4337a7bb806ea7812e591a0e428b51184 100644
--- a/include/effects/SkDropShadowImageFilter.h
+++ b/include/effects/SkDropShadowImageFilter.h
@@ -14,16 +14,17 @@ public:
     static SkDropShadowImageFilter* Create(SkScalar dx, SkScalar dy,
                                            SkScalar sigmaX, SkScalar sigmaY, SkColor color,
                                            SkImageFilter* input = NULL,
-                                           const CropRect* cropRect = NULL) {
+                                           const CropRect* cropRect = NULL,
+                                           uint32_t uniqueID = 0) {
         return SkNEW_ARGS(SkDropShadowImageFilter, (dx, dy, sigmaX, sigmaY,
-                                                    color, input, cropRect));
+                                                    color, input, cropRect, uniqueID));
     }
     virtual void computeFastBounds(const SkRect&, SkRect*) const SK_OVERRIDE;
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDropShadowImageFilter)
 
 protected:
     SkDropShadowImageFilter(SkScalar dx, SkScalar dy, SkScalar sigmaX, SkScalar sigmaY, SkColor,
-                            SkImageFilter* input, const CropRect* cropRect);
+                            SkImageFilter* input, const CropRect* cropRect, uint32_t uniqueID);
 #ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
     explicit SkDropShadowImageFilter(SkReadBuffer&);
 #endif