Prepare for date/time input datalist support

Source/core/html/forms/BaseChooserOnlyDateAndTimeInputType.cpp

Index: Source/core/html/forms/BaseChooserOnlyDateAndTimeInputType.cpp
diff --git a/Source/core/html/forms/BaseChooserOnlyDateAndTimeInputType.cpp b/Source/core/html/forms/BaseChooserOnlyDateAndTimeInputType.cpp
index 21d39a3312da26d7f03785b02abb83a62d036d86..83bfde6655a8b403a9bf434ddcc8ed46a77b9180 100644
--- a/Source/core/html/forms/BaseChooserOnlyDateAndTimeInputType.cpp
+++ b/Source/core/html/forms/BaseChooserOnlyDateAndTimeInputType.cpp
@@ -97,6 +97,14 @@ void BaseChooserOnlyDateAndTimeInputType::didChooseValue(const String& value)
     element().setValue(value, DispatchInputAndChangeEvent);
 }
 
+void BaseChooserOnlyDateAndTimeInputType::didChooseValue(double value)
+{
+    if (std::isnan(value))
+        element().setValue(String(), DispatchInputAndChangeEvent);

[tkent, 2013/11/07 01:43:10]

Are you sure this should be null string, not emptyString()?

+    else
+        element().setValueAsNumber(value, ASSERT_NO_EXCEPTION, DispatchInputAndChangeEvent);
+}
+
 void BaseChooserOnlyDateAndTimeInputType::didEndChooser()
 {
     m_dateTimeChooser.clear();