UTF-16 Decoder: Convert unpaired surrogates to replacement characters

third_party/WebKit/Source/wtf/text/TextCodecUTF16.h

Index: third_party/WebKit/Source/wtf/text/TextCodecUTF16.h
diff --git a/third_party/WebKit/Source/wtf/text/TextCodecUTF16.h b/third_party/WebKit/Source/wtf/text/TextCodecUTF16.h
index 8570d01f7ab92b0817f26668b7f67d6ed5c9b333..6df36b6890cb9b679727c726f6c6d2813026cffc 100644
--- a/third_party/WebKit/Source/wtf/text/TextCodecUTF16.h
+++ b/third_party/WebKit/Source/wtf/text/TextCodecUTF16.h
@@ -35,7 +35,7 @@ public:
     static void registerEncodingNames(EncodingNameRegistrar);
     static void registerCodecs(TextCodecRegistrar);
 
-    TextCodecUTF16(bool littleEndian) : m_littleEndian(littleEndian), m_haveBufferedByte(false) {}
+    TextCodecUTF16(bool littleEndian) : m_littleEndian(littleEndian) {}
 
     String decode(const char*, size_t length, FlushBehavior, bool stopOnError, bool& sawError) override;
     CString encode(const UChar*, size_t length, UnencodableHandling) override;
@@ -43,8 +43,10 @@ public:
 
 private:
     bool m_littleEndian;
-    bool m_haveBufferedByte;
-    unsigned char m_bufferedByte;
+    bool m_haveLeadByte = false;
+    unsigned char m_leadByte;
+    bool m_haveLeadSurrogate = false;
+    UChar m_leadSurrogate;
 };
 
 } // namespace WTF