Enable print forwarding.

tools/dom/src/native_DOMImplementation.dart

Index: tools/dom/src/native_DOMImplementation.dart
diff --git a/tools/dom/src/native_DOMImplementation.dart b/tools/dom/src/native_DOMImplementation.dart
index 9d2f5c22cdaae680bd378f0df0b73a6c0341cd33..94ba076d664f0f7486f66eaaad1464580bc5a7b2 100644
--- a/tools/dom/src/native_DOMImplementation.dart
+++ b/tools/dom/src/native_DOMImplementation.dart
@@ -47,6 +47,7 @@ class _Utils {
 
   static window() native "Utils_window";
   static print(String message) native "Utils_print";
+  static forwardingPrint(String message) native "Utils_forwardingPrint";
   static SendPort spawnDomFunctionImpl(Function topLevelFunction) native "Utils_spawnDomFunction";
   static int _getNewIsolateId() native "Utils_getNewIsolateId";
   static bool shadowRootSupported(Document document) native "Utils_shadowRootSupported";
@@ -126,3 +127,5 @@ get _printClosure => (s) {
     _Utils.print(s);
   }
 };
+
+final _forwardingPrintClosure = _Utils.forwardingPrint;