Support the 'lrm', 'rlm' and 'nbsp' entities in the WebVTTTokenizer

Source/core/html/track/WebVTTTokenizer.cpp

Index: Source/core/html/track/WebVTTTokenizer.cpp
diff --git a/Source/core/html/track/WebVTTTokenizer.cpp b/Source/core/html/track/WebVTTTokenizer.cpp
index f290cb67e272ee517297d3703ada8d2b429d9cd1..b799dbf7719637a5ea6f2968d068aab7ed5b1b52 100644
--- a/Source/core/html/track/WebVTTTokenizer.cpp
+++ b/Source/core/html/track/WebVTTTokenizer.cpp
@@ -33,6 +33,7 @@
 #include "core/html/track/WebVTTTokenizer.h"
 
 #include "core/xml/parser/MarkupTokenizerInlines.h"
+#include "wtf/unicode/CharacterNames.h"
 
 namespace WebCore {
 
@@ -107,6 +108,12 @@ bool WebVTTTokenizer::nextToken(SegmentedString& source, WebVTTToken& token)
                 bufferCharacter('<');
             else if (vectorEqualsString(m_buffer, "&gt"))
                 bufferCharacter('>');
+            else if (vectorEqualsString(m_buffer, "&lrm"))
+                bufferCharacter(leftToRightMark);
+            else if (vectorEqualsString(m_buffer, "&rlm"))
+                bufferCharacter(rightToLeftMark);
+            else if (vectorEqualsString(m_buffer, "&nbsp"))
+                bufferCharacter(noBreakSpace);
             else {
                 m_buffer.append(static_cast<LChar>(cc));
                 m_token->appendToCharacter(m_buffer);