Prepare for date/time input datalist support

Source/platform/DateTimeChooser.h

Index: Source/platform/DateTimeChooser.h
diff --git a/Source/platform/DateTimeChooser.h b/Source/platform/DateTimeChooser.h
index 1b3da625dfa3697773da8c4551a25e9339153442..510c0971ec24a1811e1629671bc247845202974d 100644
--- a/Source/platform/DateTimeChooser.h
+++ b/Source/platform/DateTimeChooser.h
@@ -38,6 +38,12 @@
 
 namespace WebCore {
 
+struct DateTimeSuggestion {
+    double value;
+    String localizedValue;
+    String label;
+};
+
 struct DateTimeChooserParameters {
     AtomicString type;
     IntRect anchorRectInRootView;
@@ -45,10 +51,8 @@ struct DateTimeChooserParameters {
     // might be an invalid name because it comes from HTML lang
     // attributes.
     AtomicString locale;
-    String currentValue;
-    Vector<String> suggestionValues;
-    Vector<String> localizedSuggestionValues;
-    Vector<String> suggestionLabels;
+    double currentValue;
+    Vector<DateTimeSuggestion> suggestions;
     double minimum;
     double maximum;
     double step;