Implement v8-like overload resolving.

lib/dom/idl/dart/dart.idl

 
 // This file introduces / supplements and forces Dart declarations.
 
 module default {
   FileList implements sequence<File>;
   HTMLCollection implements sequence<Node>;
   MediaList implements sequence<DOMString>;
   NamedNodeMap implements sequence<Node>;
   NodeList implements sequence<Node>;
   StyleSheetList implements sequence<StyleSheet>;
@@ skipping 198 matching lines @@
     [DartName=continueFunction] void continue([Optional] in IDBKey key);
   };
   [Supplemental]
   interface IDBIndex {
     [DartName=getObject] IDBRequest get(in IDBKey key);
   };
   [Supplemental]
   interface IDBObjectStore {
     [DartName=getObject] IDBRequest get(in IDBKey key);
     [DartName=getObject] IDBRequest get(in IDBKeyRange key);
-    [Suppressed] IDBRequest openCursor() raises (IDBDatabaseException);
   };
 
   interface EntrySync {
     // Native implementation is declared to return EntrySync.
     [Suppressed] DirectoryEntrySync getParent();
     EntrySync getParent();
   };
 };
 
 module html {
   [Supplemental, Callback] // Add missing Callback attribute.
   interface VoidCallback {
   };
 };
 
 module svg {
     interface SVGNumber {
       [StrictTypeChecking, Custom] attribute double value;
     };
 }