[reland] SegmentedString::push() should always push a char in front

Source/core/html/parser/HTMLEntityParser.h

Index: Source/core/html/parser/HTMLEntityParser.h
diff --git a/Source/core/html/parser/HTMLEntityParser.h b/Source/core/html/parser/HTMLEntityParser.h
index 4479c23639d64e2ed7443603142fd55b42276fec..b9cac251c3c2650c15670c9416eddb3773f47b8a 100644
--- a/Source/core/html/parser/HTMLEntityParser.h
+++ b/Source/core/html/parser/HTMLEntityParser.h
@@ -27,6 +27,7 @@
 #ifndef HTMLEntityParser_h
 #define HTMLEntityParser_h
 
+#include "core/CoreExport.h"
 #include "platform/text/SegmentedString.h"
 #include "wtf/Allocator.h"
 
@@ -63,11 +64,11 @@ public:
     UChar data[kMaxLength];
 };
 
-bool consumeHTMLEntity(SegmentedString&, DecodedHTMLEntity& decodedEntity, bool& notEnoughCharacters, UChar additionalAllowedCharacter = '\0');
+CORE_EXPORT bool consumeHTMLEntity(SegmentedString&, DecodedHTMLEntity& decodedEntity, bool& notEnoughCharacters, UChar additionalAllowedCharacter = '\0');
 
 // Used by the XML parser.  Not suitable for use in HTML parsing.  Use consumeHTMLEntity instead.
 size_t decodeNamedEntityToUCharArray(const char*, UChar result[4]);
 
-}
+} // namespace blink
 
 #endif