Handle html+mirrors

pkg/compiler/lib/src/js_backend/backend.dart

 // Copyright (c) 2012, 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 js_backend.backend;
 
 import 'dart:async' show Future;
 
 import 'package:js_runtime/shared/embedded_names.dart' as embeddedNames;
 
@@ skipping 2326 matching lines @@
         staticFields.add(target);
       } else if (target.isLibrary || target.isClass) {
         addFieldsInContainer(target);
       }
     }
     return staticFields;
   }
 
   /// Called when [enqueuer] is empty, but before it is closed.
   bool onQueueEmpty(Enqueuer enqueuer, Iterable<ClassElement> recentClasses) {
-    // Add elements referenced only via custom elements.  Return early if any
-    // elements are added to avoid counting the elements as due to mirrors.
-    customElementsAnalysis.onQueueEmpty(enqueuer);
+    if (!compiler.options.resolveOnly) {
+      // TODO(johnniwinther): The custom element analysis eagerly enqueues
+      // elements on the codegen queue. Change to compute the data needed
+      // instead.
+
+      // Add elements referenced only via custom elements.  Return early if any
+      // elements are added to avoid counting the elements as due to mirrors.
+      customElementsAnalysis.onQueueEmpty(enqueuer);
+    }
     if (!enqueuer.queueIsEmpty) return false;
 
     noSuchMethodRegistry.onQueueEmpty();
     if (!enabledNoSuchMethod &&
         (noSuchMethodRegistry.hasThrowingNoSuchMethod ||
             noSuchMethodRegistry.hasComplexNoSuchMethod)) {
       enableNoSuchMethod(enqueuer);
       enabledNoSuchMethod = true;
     }
 
@@ skipping 838 matching lines @@
 
   @override
   void onImpactUsed(ImpactUseCase impactUse) {
     if (impactUse == DeferredLoadTask.IMPACT_USE && !supportSerialization) {
       // TODO(johnniwinther): Allow emptying when serialization has been
       // performed.
       resolution.emptyCache();
     }
   }
 }