Decouple tokenizer/tree builder state from WebVTTParser

Source/core/html/track/WebVTTParser.h

Index: Source/core/html/track/WebVTTParser.h
diff --git a/Source/core/html/track/WebVTTParser.h b/Source/core/html/track/WebVTTParser.h
index d031a376c27b1a691e8190d39bd6fa5c06ddfe0e..d21e8e64dab9f82372fb42055e8afb70b349cb6c 100644
--- a/Source/core/html/track/WebVTTParser.h
+++ b/Source/core/html/track/WebVTTParser.h
@@ -100,6 +100,9 @@ public:
     static float parseFloatPercentageValue(const String&, bool&);
     static FloatPoint parseFloatPercentageValuePair(const String&, char, bool&);
 
+    // Create the DocumentFragment representation of the WebVTT cue text.
+    static PassRefPtr<DocumentFragment> createDocumentFragmentFromCueText(Document&, const String&);
+
     // Input data to the parser to parse.
     void parseBytes(const char* data, unsigned length);
 
@@ -107,8 +110,6 @@ public:
     void getNewCues(Vector<RefPtr<TextTrackCue> >&);
     void getNewRegions(Vector<RefPtr<TextTrackRegion> >&);
 
-    PassRefPtr<DocumentFragment> createDocumentFragmentFromCueText(const String&);
-
 private:
     WebVTTParser(WebVTTParserClient*, Document&);
 
@@ -131,8 +132,6 @@ private:
     static void skipLineTerminator(const String& data, unsigned*);
     static String collectNextLine(const String& data, unsigned*);
 
-    void constructTreeFromToken(Document&);
-
     String m_currentHeaderName;
     String m_currentHeaderValue;
 
@@ -143,14 +142,8 @@ private:
     StringBuilder m_currentContent;
     String m_currentSettings;
 
-    WebVTTToken m_token;
-    OwnPtr<WebVTTTokenizer> m_tokenizer;
-
-    RefPtr<ContainerNode> m_currentNode;
-
     WebVTTParserClient* m_client;
 
-    Vector<AtomicString> m_languageStack;
     Vector<RefPtr<TextTrackCue> > m_cuelist;
 
     Vector<RefPtr<TextTrackRegion> > m_regionList;