Make backend.setAnnotations (mostly) handle LibraryEntities.

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 '../common.dart';
 import '../common/backend_api.dart'
     show ForeignResolver, NativeRegistry, ImpactTransformer;
 import '../common/codegen.dart' show CodegenImpact, CodegenWorkItem;
@@ skipping 1073 matching lines @@
         element == commonElements.doubleClass ||
         element == commonElements.jsArrayClass ||
         element == commonElements.jsMutableArrayClass ||
         element == commonElements.jsExtendableArrayClass ||
         element == commonElements.jsFixedArrayClass ||
         element == commonElements.jsUnmodifiableArrayClass;
   }
 
   /// This method is called immediately after the [library] and its parts have
   /// been loaded.
-  void setAnnotations(LibraryElement library) {
+  void setAnnotations(LibraryEntity library) {
     if (!compiler.serialization.isDeserialized(library)) {
+      AnnotationProcessor processor = new AnnotationProcessor(compiler);
       if (canLibraryUseNative(library)) {
-        library.forEachLocalMember((Element element) {
-          if (element.isClass) {
-            checkNativeAnnotation(compiler, element, nativeBasicDataBuilder);
-          }
-        });
+        processor.extractNativeAnnotations(library, nativeBasicDataBuilder);
       }
-      checkJsInteropClassAnnotations(compiler, library, nativeBasicDataBuilder);
+      processor.extractJsInteropAnnotations(library, nativeBasicDataBuilder);
     }
     Uri uri = library.canonicalUri;
     if (uri == Uris.dart_html) {
       htmlLibraryIsLoaded = true;
     } else if (uri == LookupMapResolutionAnalysis.PACKAGE_LOOKUP_MAP) {
       lookupMapResolutionAnalysis.init(library);
     }
     annotations.onLibraryLoaded(library);
   }
 
@@ skipping 379 matching lines @@
 
   bool canUseAliasedSuperMember(MemberEntity member, Selector selector) {
     return !selector.isGetter;
   }
 
   /// Returns `true` if [member] is called from a subclass via `super`.
   bool isAliasedSuperMember(MemberEntity member) {
     return _aliasedSuperMembers.contains(member);
   }
 }