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 a8b85ebc63330c9eb8ae5bda64594e9e04c055a2..14fdf18b35162ac30d190a13ef38cd53f1e006de 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;