Use JS backend in serialization_analysis_test

pkg/compiler/lib/src/elements/common.dart

 // Copyright (c) 2015, 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.
 
 /// Mixins that implement convenience methods on [Element] subclasses.
 
 library elements.common;
 
 import '../common/names.dart' show
     Names,
@@ skipping 105 matching lines @@
 
   @override
   Element get patch {
     throw new UnsupportedError('patch is not supported on $this');
   }
 
   @override
   Element get origin {
     throw new UnsupportedError('origin is not supported on $this');
   }
+
+  @override
+  ClassElement get contextClass {
+    ClassElement cls;
+    for (Element e = this; e != null; e = e.enclosingElement) {
+      if (e.isClass) {
+        // Record [e] instead of returning it directly. We need the last class
+        // in the chain since the first classes might be closure classes.
+        cls = e.declaration;
+      }
+    }
+    return cls;
+  }
 }
 
 abstract class LibraryElementCommon implements LibraryElement {
   @override
   bool get isDartCore => canonicalUri == Uris.dart_core;
 
   @override
   bool get isPlatformLibrary => canonicalUri.scheme == 'dart';
 
   @override
@@ skipping 188 matching lines @@
     do {
       // Iterate through the members in textual order, which requires
       // to reverse the data structure [localMembers] we created.
       // Textual order may be important for certain operations, for
       // example when emitting the initializers of fields.
       classElement.forEachLocalMember((e) => f(classElement, e));
       if (includeBackendMembers) {
         classElement.forEachBackendMember((e) => f(classElement, e));
       }
       if (includeInjectedMembers) {
-        if (classElement.patch != null) {
+        if (classElement.isPatched) {
           classElement.patch.forEachLocalMember((e) {
             if (!e.isPatch) f(classElement, e);
           });
         }
       }
       classElement = includeSuperAndInjectedMembers
           ? classElement.superclass
           : null;
     } while (classElement != null);
   }
@@ skipping 145 matching lines @@
       // this signature must not have more required parameters.  Having more
       // optional parameters is not a problem, they simply are never provided
       // by call sites of a call to a method with the other signature.
       int otherTotalCount = signature.parameterCount;
       return requiredParameterCount <= otherTotalCount
           && parameterCount >= otherTotalCount;
     }
     return true;
   }
 }