Fix summary handling of invalid annotations of the form `@a.b.c`.

pkg/analyzer/lib/src/summary/resynthesize.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 summary_resynthesizer;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_ast_factory.dart';
@@ skipping 1503 matching lines @@
       SimpleIdentifier constructorName = constExpr.constructorName.name;
       if (typeName is SimpleIdentifier && constructorName != null) {
         // E.g. `@cls.ctor()`.  Since `cls.ctor` would have been parsed as
         // a PrefixedIdentifier, we need to resynthesize it as one.
         typeName = AstTestFactory.identifier(typeName, constructorName);
         constructorName = null;
       }
       elementAnnotation.annotationAst = AstTestFactory.annotation2(
           typeName, constructorName, constExpr.argumentList)
         ..element = constExpr.staticElement;
+    } else if (constExpr is PropertyAccess) {
+      var target = constExpr.target as Identifier;
+      var propertyName = constExpr.propertyName;
+      ArgumentList arguments =
+          constExpr.getProperty(_ConstExprBuilder.ARGUMENT_LIST);
+      elementAnnotation.element = propertyName.staticElement;
+      elementAnnotation.annotationAst = AstTestFactory.annotation2(
+          target, propertyName, arguments)
+        ..element = propertyName.staticElement;
     } else {
       throw new StateError(
           'Unexpected annotation type: ${constExpr.runtimeType}');
     }
     return elementAnnotation;
   }
 
   /**
    * Build an implicit getter for the given [property] and bind it to the
    * [property] and to its enclosing element.
@@ skipping 336 matching lines @@
   static String _getElementIdentifier(String name, ReferenceKind kind) {
     if (kind == ReferenceKind.topLevelPropertyAccessor ||
         kind == ReferenceKind.propertyAccessor) {
       if (!name.endsWith('=')) {
         return name + '?';
       }
     }
     return name;
   }
 }