Add StaticUse for more precise registration of statically known element use.

pkg/compiler/lib/src/js_backend/codegen/glue.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library code_generator_dependencies;
 
 import '../backend_helpers.dart' show
     BackendHelpers;
 import '../js_backend.dart';
 
@@ skipping 259 matching lines @@
   ClassElement get jsMutableArrayClass => _helpers.jsMutableArrayClass;
 
   bool isStringClass(ClassElement classElement) =>
       classElement == _helpers.jsStringClass ||
       classElement == _compiler.coreClasses.stringClass;
 
   bool isBoolClass(ClassElement classElement) =>
       classElement == _helpers.jsBoolClass ||
       classElement == _compiler.coreClasses.boolClass;
 
-  // TODO(sra): Should this be part of CodegenRegistry?
+  // TODO(sra,johnniwinther): Should this be part of CodegenRegistry?
   void registerNativeBehavior(NativeBehavior nativeBehavior, node) {
     if (nativeBehavior == null) return;
     _enqueuer.nativeEnqueuer.registerNativeBehavior(nativeBehavior, node);
   }
 
   ConstantValue getDefaultParameterValue(ParameterElement elem) {
     return _backend.constants.getConstantValueForVariable(elem);
   }
 }