Reimplement deserialization of SkImageFilter's uniqueID.

include/effects/SkDisplacementMapEffect.h

Index: include/effects/SkDisplacementMapEffect.h
diff --git a/include/effects/SkDisplacementMapEffect.h b/include/effects/SkDisplacementMapEffect.h
index a26d5a2e53916879ae594aafc8126fcc30204823..0a658aceaf7629c1826d598868032ef1134cd59a 100644
--- a/include/effects/SkDisplacementMapEffect.h
+++ b/include/effects/SkDisplacementMapEffect.h
@@ -27,7 +27,8 @@ public:
                                            ChannelSelectorType yChannelSelector,
                                            SkScalar scale, SkImageFilter* displacement,
                                            SkImageFilter* color = NULL,
-                                           const CropRect* cropRect = NULL);
+                                           const CropRect* cropRect = NULL,
+                                           uint32_t uniqueID = 0);
 
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDisplacementMapEffect)
 
@@ -51,7 +52,8 @@ protected:
     SkDisplacementMapEffect(ChannelSelectorType xChannelSelector,
                             ChannelSelectorType yChannelSelector,
                             SkScalar scale, SkImageFilter* inputs[2],
-                            const CropRect* cropRect);
+                            const CropRect* cropRect,
+                            uint32_t uniqueID);
 #ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
     explicit SkDisplacementMapEffect(SkReadBuffer& buffer);
 #endif