Reimplement deserialization of SkImageFilter's uniqueID.

src/effects/SkDropShadowImageFilter.cpp

Index: src/effects/SkDropShadowImageFilter.cpp
diff --git a/src/effects/SkDropShadowImageFilter.cpp b/src/effects/SkDropShadowImageFilter.cpp
index f1ebae8d97de2493f458c7399b145348bc7eac1b..b0205c002dd44b70d6a02985b35051e84470b2c0 100644
--- a/src/effects/SkDropShadowImageFilter.cpp
+++ b/src/effects/SkDropShadowImageFilter.cpp
@@ -17,8 +17,9 @@
 
 SkDropShadowImageFilter::SkDropShadowImageFilter(SkScalar dx, SkScalar dy,
                                                  SkScalar sigmaX, SkScalar sigmaY, SkColor color,
-                                                 SkImageFilter* input, const CropRect* cropRect)
-    : INHERITED(1, &input, cropRect)
+                                                 SkImageFilter* input, const CropRect* cropRect,
+                                                 uint32_t uniqueID)
+    : INHERITED(1, &input, cropRect, uniqueID)
     , fDx(dx)
     , fDy(dy)
     , fSigmaX(sigmaX)
@@ -49,7 +50,7 @@ SkFlattenable* SkDropShadowImageFilter::CreateProc(SkReadBuffer& buffer) {
     SkScalar sigmaX = buffer.readScalar();
     SkScalar sigmaY = buffer.readScalar();
     SkColor color = buffer.readColor();
-    return Create(dx, dy, sigmaX, sigmaY, color, common.getInput(0), &common.cropRect());
+    return Create(dx, dy, sigmaX, sigmaY, color, common.getInput(0), &common.cropRect(), common.uniqueID());
 }
 
 void SkDropShadowImageFilter::flatten(SkWriteBuffer& buffer) const {