Add documentationComment for Class to Kernel. Parse it. Resynthesize in Analyzer.

pkg/analyzer/test/src/summary/resynthesize_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.
 
 library test.src.serialization.elements_test;
 
 import 'dart:async';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_resolution_map.dart';
@@ skipping 2095 matching lines @@
 class C {
   C.foo();
   C.bar();
 }
 ''');
     }
   }
 
   test_class_documented() async {
     var library = await checkLibrary('''
-// Extra comment so doc comment offset != 0
 /**
  * Docs
  */
 class C {}''');
-    if (isStrongMode) {
-      checkElementText(library, r'''
+    checkElementText(library, r'''
 /**
  * Docs
  */
 class C {
 }
 ''');
-    } else {
-      checkElementText(library, r'''
-/**
- * Docs
- */
-class C {
-}
-''');
-    }
   }
 
   test_class_documented_tripleSlash() async {
     var library = await checkLibrary('''
 /// aaa
 /// bbbb
 /// cc
 class C {}''');
     if (isStrongMode) {
       checkElementText(library, r'''
@@ skipping 64 matching lines @@
       checkElementText(library, r'''
 /**
  * Docs
  */
 class C {
 }
 ''');
     }
   }
 
+  test_class_documented_withLeadingNotDocumentation() async {
+    var library = await checkLibrary('''
+// Extra comment so doc comment offset != 0
+/**
+ * Docs
+ */
+class C {}''');
+    checkElementText(library, r'''
+/**
+ * Docs
+ */
+class C {
+}
+''');
+  }
+
   test_class_field_const() async {
     var library = await checkLibrary('class C { static const int i = 0; }');
     if (isStrongMode) {
       checkElementText(library, r'''
 class C {
   static const int i = 0;
 }
 ''');
     } else {
       checkElementText(library, r'''
@@ skipping 10881 matching lines @@
       fail('Unexpectedly tried to get unlinked summary for $uri');
     }
     return serializedUnit;
   }
 
   @override
   bool hasLibrarySummary(String uri) {
     return true;
   }
 }