Adding more validation

src/effects/SkRectShaderImageFilter.cpp

Index: src/effects/SkRectShaderImageFilter.cpp
diff --git a/src/effects/SkRectShaderImageFilter.cpp b/src/effects/SkRectShaderImageFilter.cpp
index 81aa91ca71f0bf7a118f87f94384851b156e4d43..ab38fc48792c27e5a2d2b4a5e10bee4b9e10b2dc 100644
--- a/src/effects/SkRectShaderImageFilter.cpp
+++ b/src/effects/SkRectShaderImageFilter.cpp
@@ -35,7 +35,7 @@ SkRectShaderImageFilter::SkRectShaderImageFilter(SkShader* s, const CropRect* cr
 }
 
 SkRectShaderImageFilter::SkRectShaderImageFilter(SkFlattenableReadBuffer& buffer)
-  : INHERITED(buffer) {
+  : INHERITED(1, buffer) {
     fShader = buffer.readShader();
 }