Dartium JS Interop enabled.

tools/dom/src/dartium_KeyEvent.dart

Index: tools/dom/src/dartium_KeyEvent.dart
diff --git a/tools/dom/src/dartium_KeyEvent.dart b/tools/dom/src/dartium_KeyEvent.dart
index 2d133d341573245236d6bb4f10d53773e9a24fcd..b93feeb1e8d981197df789ab57ee97a67c0aee6e 100644
--- a/tools/dom/src/dartium_KeyEvent.dart
+++ b/tools/dom/src/dartium_KeyEvent.dart
@@ -29,6 +29,13 @@ part of html;
 
 @Experimental()
 class KeyEvent extends _WrappedEvent implements KeyboardEvent {
+  /** Needed because KeyboardEvent is implements.
+   *  TODO(terry): Consider making blink_jsObject private (add underscore) for
+   *               all blink_jsObject.  Then needed private wrap/unwrap_jso
+   *               functions that delegate to a public wrap/unwrap_jso.
+   */
+  js.JsObject blink_jsObject;
+
   /** The parent KeyboardEvent that this KeyEvent is wrapping and "fixing". */
   KeyboardEvent _parent;