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

Source/core/rendering/RenderTheme.h

Index: Source/core/rendering/RenderTheme.h
diff --git a/Source/core/rendering/RenderTheme.h b/Source/core/rendering/RenderTheme.h
index 9603f6f4414c98801cc76a25b4da1e5113b5e408..d7dda0ce87c048cb0a958c1a8137843f79685d3d 100644
--- a/Source/core/rendering/RenderTheme.h
+++ b/Source/core/rendering/RenderTheme.h
@@ -191,6 +191,8 @@ public:
 
     virtual bool supportsSelectionForegroundColors() const { return true; }
 
+    virtual bool isModalColorChooser() const { return true; }
+
 protected:
     // The platform selection color.
     virtual Color platformActiveSelectionBackgroundColor() const;