Merge bools into bit fields in TextTrackCue and VTTCue

Source/core/html/track/vtt/VTTCue.h

Index: Source/core/html/track/vtt/VTTCue.h
diff --git a/Source/core/html/track/vtt/VTTCue.h b/Source/core/html/track/vtt/VTTCue.h
index c44a07488a0d03e85d3d65793c773cce0d9ec6d6..b0e02613708fba38a8b30e758a9fdc4fe6b10de5 100644
--- a/Source/core/html/track/vtt/VTTCue.h
+++ b/Source/core/html/track/vtt/VTTCue.h
@@ -172,24 +172,20 @@ private:
     int m_textPosition;
     int m_cueSize;
     WritingDirection m_writingDirection;
-
     CueAlignment m_cueAlignment;
+    String m_regionId;
 
     RefPtr<DocumentFragment> m_vttNodeTree;
-    bool m_snapToLines;
-
     RefPtr<HTMLDivElement> m_cueBackgroundBox;
-
-    bool m_displayTreeShouldChange;
     RefPtr<VTTCueBox> m_displayTree;
 
     CSSValueID m_displayDirection;
-
     int m_displaySize;
-
     std::pair<float, float> m_displayPosition;
-    String m_regionId;
-    bool m_notifyRegion;
+
+    bool m_snapToLines : 1;
+    bool m_displayTreeShouldChange : 1;
+    bool m_notifyRegion : 1;
 };
 
 inline VTTCue* toVTTCue(TextTrackCue* cue)