Make classes and structures in core/html fast-allocated.

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

 /*
  * Copyright (c) 2013, Opera Software ASA. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 14 matching lines @@
  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef VTTCue_h
 #define VTTCue_h
 
 #include "core/html/track/TextTrackCue.h"
 #include "platform/heap/Handle.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
 class Document;
 class DoubleOrAutoKeyword;
 class ExecutionContext;
 class VTTCue;
 class VTTScanner;
 
 struct VTTDisplayParameters {
+    STACK_ALLOCATED();
     VTTDisplayParameters();
 
     FloatPoint position;
     float size;
     CSSValueID direction;
     CSSValueID textAlign;
     CSSValueID writingMode;
     float snapToLinesPosition;
 };
 
@@ skipping 137 matching lines @@
     bool m_snapToLines : 1;
     bool m_displayTreeShouldChange : 1;
 };
 
 // VTTCue is currently the only TextTrackCue subclass.
 DEFINE_TYPE_CASTS(VTTCue, TextTrackCue, cue, true, true);
 
 } // namespace blink
 
 #endif // VTTCue_h