INPUT element: Updating 'step' attribute should adjust the last value.

third_party/WebKit/Source/core/html/HTMLInputElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Samsung Electronics. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 107 matching lines @@
 
   void setType(const AtomicString&);
 
   String value() const override;
   void setValue(const String&,
                 ExceptionState&,
                 TextFieldEventBehavior = DispatchNoEvent);
   void setValue(const String&,
                 TextFieldEventBehavior = DispatchNoEvent) override;
   void setValueForUser(const String&);
+  // Update the value, and clear hasDirtyValue() flag.
+  void setNonDirtyValue(const String&);
   // Checks if the specified string would be a valid value.
   // We should not call this for types with no string value such as CHECKBOX and
   // RADIO.
   bool isValidValue(const String&) const;
   bool hasDirtyValue() const;
 
   String sanitizeValue(const String&) const;
 
   String localizeValue(const String&) const;
 
@@ skipping 260 matching lines @@
 
   // Returns null if this isn't associated with any radio button group.
   RadioButtonGroupScope* radioButtonGroupScope() const;
   void addToRadioButtonGroup();
   void removeFromRadioButtonGroup();
   PassRefPtr<ComputedStyle> customStyleForLayoutObject() override;
 
   bool shouldDispatchFormControlChangeEvent(String&, String&) override;
 
   AtomicString m_name;
-  // A dirty value.  isNull() means the value is not dirty and we should refer
-  // to |value| content attribute value.
+  // The value string in |value| value mode.
+  // TODO(tkent): Rename it to m_nonAttributeValue.
   String m_valueIfDirty;
   String m_suggestedValue;
   int m_size;
   int m_maxLength;
   int m_minLength;
   // https://html.spec.whatwg.org/multipage/forms.html#concept-input-value-dirty-flag
   unsigned m_hasDirtyValue : 1;
   // https://html.spec.whatwg.org/multipage/forms.html#concept-fe-checked
   unsigned m_isChecked : 1;
   // https://html.spec.whatwg.org/multipage/forms.html#concept-input-checked-dirty-flag
@@ skipping 15 matching lines @@
   // assumes that it lives as long as its owning element lives. If we move the
   // loader into the ImageInput object we may delete the loader while this
   // element lives on.
   Member<HTMLImageLoader> m_imageLoader;
   Member<ListAttributeTargetObserver> m_listAttributeTargetObserver;
 };
 
 }  // namespace blink
 
 #endif  // HTMLInputElement_h