Merge 135131 - input.value="" should clear date/time input elements with partial values

Source/WebCore/html/BaseMultipleFieldsDateAndTimeInputType.cpp

 /*
  * Copyright (C) 2010 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 280 matching lines @@
 {
     if (!m_dateTimeEditElement)
         return FormControlState();
 
     return m_dateTimeEditElement->valueAsDateTimeFieldsState().saveFormControlState();
 }
 
 void BaseMultipleFieldsDateAndTimeInputType::setValue(const String& sanitizedValue, bool valueChanged, TextFieldEventBehavior eventBehavior)
 {
     InputType::setValue(sanitizedValue, valueChanged, eventBehavior);
-    if (valueChanged)
+    if (valueChanged || (sanitizedValue.isEmpty() && m_dateTimeEditElement && m_dateTimeEditElement->valueAsDateTimeFieldsState().hasAnyValue()))
         updateInnerTextValue();
 }
 
 bool BaseMultipleFieldsDateAndTimeInputType::shouldUseInputMethod() const
 {
     return false;
 }
 
 void BaseMultipleFieldsDateAndTimeInputType::stepAttributeChanged()
 {
@@ skipping 85 matching lines @@
 {
     StepRange stepRange = createStepRange(AnyIsDefaultStep);
     return date.second() || date.millisecond()
         || !stepRange.minimum().remainder(static_cast<int>(msPerMinute)).isZero()
         || !stepRange.step().remainder(static_cast<int>(msPerMinute)).isZero();
 }
 
 } // namespace WebCore
 
 #endif