Adding more validation

src/effects/SkTileImageFilter.cpp

Index: src/effects/SkTileImageFilter.cpp
diff --git a/src/effects/SkTileImageFilter.cpp b/src/effects/SkTileImageFilter.cpp
index 8cc096cf370043b4ecbd813bb171305cef43126f..ccca4ff74caf3a75ccd7e43cb6d22246d91f9674 100644
--- a/src/effects/SkTileImageFilter.cpp
+++ b/src/effects/SkTileImageFilter.cpp
@@ -54,7 +54,8 @@ bool SkTileImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src, const S
     return true;
 }
 
-SkTileImageFilter::SkTileImageFilter(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {
+SkTileImageFilter::SkTileImageFilter(SkFlattenableReadBuffer& buffer)
+  : INHERITED(1, buffer) {
     buffer.readRect(&fSrcRect);
     buffer.readRect(&fDstRect);
     buffer.validate(SkIsValidRect(fSrcRect) && SkIsValidRect(fDstRect));