Transfer date/time value to the chooser as a double

Source/platform/DateTimeChooserClient.h

 /*
  * Copyright (C) 2012 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 24 matching lines @@
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class PLATFORM_EXPORT DateTimeChooserClient {
 public:
     virtual ~DateTimeChooserClient();
 
     // Called when user picked a value.
     virtual void didChooseValue(const String&) = 0;
+    // Called when user picked a value.
+    virtual void didChooseValue(double) = 0;
     // Called when chooser has ended.
     virtual void didEndChooser() = 0;
 };
 
 } // namespace WebCore
 #endif // DateTimeChooserClient_h