Adding more validation

src/effects/SkMatrixConvolutionImageFilter.cpp

Index: src/effects/SkMatrixConvolutionImageFilter.cpp
diff --git a/src/effects/SkMatrixConvolutionImageFilter.cpp b/src/effects/SkMatrixConvolutionImageFilter.cpp
index 6f213d71184887a8c61c5ee0c27489d374256003..94c75cd8a7dc67b05d992930d7fdf98c3c462a23 100644
--- a/src/effects/SkMatrixConvolutionImageFilter.cpp
+++ b/src/effects/SkMatrixConvolutionImageFilter.cpp
@@ -58,7 +58,7 @@ SkMatrixConvolutionImageFilter::SkMatrixConvolutionImageFilter(
 }
 
 SkMatrixConvolutionImageFilter::SkMatrixConvolutionImageFilter(SkFlattenableReadBuffer& buffer)
-    : INHERITED(buffer) {
+    : INHERITED(buffer, SkImageFilter::kOneInput) {
     // We need to be able to read at most SK_MaxS32 bytes, so divide that
     // by the size of a scalar to know how many scalars we can read.
     static const int32_t kMaxSize = SK_MaxS32 / sizeof(SkScalar);