Dispatch change event for input type=color when colorpicker is closed

Source/core/html/forms/InputType.h

Index: Source/core/html/forms/InputType.h
diff --git a/Source/core/html/forms/InputType.h b/Source/core/html/forms/InputType.h
index b369c528db304db10d2c96330efbd36b8f51a88c..ccdca1d60d1008ec5f86f48eecec761fc3e38453 100644
--- a/Source/core/html/forms/InputType.h
+++ b/Source/core/html/forms/InputType.h
@@ -208,6 +208,9 @@ public:
 
     virtual bool shouldDispatchFormControlChangeEvent(String&, String&);
 
+    // For test purpose
+    virtual void didEndChooser();
+
 protected:
     InputType(HTMLInputElement& element) : InputTypeView(element) { }
     Chrome* chrome() const;