Transfer date/time value to the chooser as a double

public/web/WebDateTimeChooserCompletion.h

Index: public/web/WebDateTimeChooserCompletion.h
diff --git a/public/web/WebDateTimeChooserCompletion.h b/public/web/WebDateTimeChooserCompletion.h
index 91fe00b64f5652f5c9c473a7a744f32251afbf7b..38ab250e151d303477ce128dd9e4e457b5c0b12b 100644
--- a/public/web/WebDateTimeChooserCompletion.h
+++ b/public/web/WebDateTimeChooserCompletion.h
@@ -36,8 +36,14 @@ public:
 
     // Called with a date/time value in the HTML format. The callback instance
     // is destroyed when this method is called.
+    // FIXME: Remove. Deprecated in favor of double version.
     virtual void didChooseValue(const WebString&) = 0;
 
+    // Called with a date/time value in the HTML format. The callback instance
+    // is destroyed when this method is called. If the value is NaN it means an
+    // empty value. Value should not be infinity.
+    virtual void didChooseValue(double) = 0;
+
     // Called when a user closed the chooser without choosing a value. The
     // callback instance is destroyed when this method is called.
     virtual void didCancelChooser() = 0;