Fix ImageFilter fuzzer issue

src/core/SkReadBuffer.cpp

Index: src/core/SkReadBuffer.cpp
diff --git a/src/core/SkReadBuffer.cpp b/src/core/SkReadBuffer.cpp
index abd46312f747e80e744f636d15cadb7672fa925d..bafcbc2b91de9c391510dee0b425980d5efb1764 100644
--- a/src/core/SkReadBuffer.cpp
+++ b/src/core/SkReadBuffer.cpp
@@ -138,6 +138,10 @@ void SkReadBuffer::readRect(SkRect* rect) {
     memcpy(rect, fReader.skip(sizeof(SkRect)), sizeof(SkRect));
 }
 
+void SkReadBuffer::readRRect(SkRRect* rrect) {
+    fReader.readRRect(rrect);
+}
+
 void SkReadBuffer::readRegion(SkRegion* region) {
     fReader.readRegion(region);
 }