Add NativeEnqueuer to work with the Enqueuer.

sdk/lib/_internal/compiler/implementation/dart2js.dart

Index: sdk/lib/_internal/compiler/implementation/dart2js.dart
diff --git a/sdk/lib/_internal/compiler/implementation/dart2js.dart b/sdk/lib/_internal/compiler/implementation/dart2js.dart
index 5c631671d4acb50b1437d966abea505788bdf411..6cfe08ea480aea45b22b7b8fe7b1967d9fdb27d3 100644
--- a/sdk/lib/_internal/compiler/implementation/dart2js.dart
+++ b/sdk/lib/_internal/compiler/implementation/dart2js.dart
@@ -163,6 +163,7 @@ void compile(List<String> argv) {
     new OptionHandler(r'--help|/\?|/h', (_) => wantHelp = true),
     new OptionHandler('--package-root=.+|-p.+', setPackageRoot),
     new OptionHandler('--disallow-unsafe-eval', passThrough),
+    new OptionHandler('--enable-native-live-type-analysis', passThrough),
     // The following two options must come last.
     new OptionHandler('-.*', (String argument) {
       helpAndFail('Error: Unknown option "$argument".');
@@ -402,6 +403,10 @@ be removed in a future version:
   --enable-concrete-type-inference
     Enable experimental concrete type inference.
 
+  --enable-native-live-type-analysis

[ahe, 2012/11/14 13:51:30]

It's great that you added documentation.  I forgot to do so myself in my
--analyze-all, so thank you for reminding me :-)

+    Remove unused native types from dart:html and related libraries. This is
+    expected to become the default behavior.
+
   --disallow-unsafe-eval
     Disables dynamic generation of code in the generated output. This is
     necessary to satisfy CSP restrictions (see http://www.w3.org/TR/CSP/).