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

Source/core/html/shadow/DateTimeEditElement.h

 /*
  * Copyright (C) 2012 Google Inc. 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 12 matching lines @@
  * SUCH DAMAGE.
  */
 
 #ifndef DateTimeEditElement_h
 #define DateTimeEditElement_h
 
 #if ENABLE(INPUT_MULTIPLE_FIELDS_UI)
 #include "core/html/forms/StepRange.h"
 #include "core/html/shadow/DateTimeFieldElement.h"
 #include "platform/DateComponents.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
 class DateTimeFieldsState;
 class Locale;
 class StepRange;
 
 // DateTimeEditElement class contains numberic field and symbolc field for
 // representing date and time, such as
 //  - Year, Month, Day Of Month
@@ skipping 12 matching lines @@
         virtual void didFocusOnControl() = 0;
         virtual void editControlValueChanged() = 0;
         virtual String formatDateTimeFieldsState(const DateTimeFieldsState&) const = 0;
         virtual bool isEditControlOwnerDisabled() const = 0;
         virtual bool isEditControlOwnerReadOnly() const = 0;
         virtual AtomicString localeIdentifier() const = 0;
         virtual void editControlDidChangeValueByKeyboard() = 0;
     };
 
     struct LayoutParameters {
+        STACK_ALLOCATED();
         String dateTimeFormat;
         String fallbackDateTimeFormat;
         Locale& locale;
         const StepRange stepRange;
         DateComponents minimum;
         DateComponents maximum;
         String placeholderForDay;
         String placeholderForMonth;
         String placeholderForYear;
 
@@ skipping 76 matching lines @@
     WillBeHeapVector<RawPtrWillBeMember<DateTimeFieldElement>, maximumNumberOfFields> m_fields;
     RawPtrWillBeMember<EditControlOwner> m_editControlOwner;
 };
 
 DEFINE_TYPE_CASTS(DateTimeEditElement, Element, element, element->isDateTimeEditElement(), element.isDateTimeEditElement());
 
 } // namespace blink
 
 #endif
 #endif