Updating Clipboard.setDragImage to accept elements.

tools/dom/idl/dart/dart.idl

Index: tools/dom/idl/dart/dart.idl
diff --git a/tools/dom/idl/dart/dart.idl b/tools/dom/idl/dart/dart.idl
index b307156119ab8f044210fdc2e068e086a48af48c..552384361499096e3cc2bfe0ec032cf5178c8c33 100644
--- a/tools/dom/idl/dart/dart.idl
+++ b/tools/dom/idl/dart/dart.idl
@@ -23,6 +23,12 @@ interface AudioParam {
 };
 
 [Supplemental]
+interface Clipboard {
+  [Suppressed] void setDragImage(HTMLImageElement image, long x, long y);
+  [Custom] void setDragImage(Element element, long x, long y);
+};
+
+[Supplemental]
 interface Document {
   [Suppressed] DOMObject getCSSCanvasContext(DOMString contextId, DOMString name, long width, long height);
   CanvasRenderingContext getCSSCanvasContext(DOMString contextId, DOMString name, long width, long height);