Record information about a summary's dependencies in the summary itself.

pkg/analyzer/test/src/summary/linker_test.dart

 // Copyright (c) 2016, 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.
 
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/dart/element/element.dart';
 import 'package:analyzer/src/summary/format.dart';
 import 'package:analyzer/src/summary/idl.dart';
 import 'package:analyzer/src/summary/link.dart';
 import 'package:unittest/unittest.dart';
@@ skipping 154 matching lines @@
 var x = 0;
 ''',
         path: '/a.dart');
     addBundle('/a.ds', bundle1);
     var bundle2 = createPackageBundle(
         '''
 import "a.dart";
 var y = x;
 ''',
         path: '/b.dart');
+    expect(bundle2.dependencies, hasLength(1));
+    expect(bundle2.dependencies[0].summaryPath, '/a.ds');
+    expect(bundle2.dependencies[0].apiSignature, bundle1.apiSignature);
     addBundle('/a.ds', bundle1);
     addBundle('/b.ds', bundle2);
     createLinker('''
 import "b.dart";
 var z = y;
 ''');
     LibraryElementForLink library = linker.getLibrary(linkerInputs.testDartUri);
     expect(_getVariable(library.getContainedName('z')).inferredType.toString(),
         'int');
   }
@@ skipping 665 matching lines @@
     PropertyAccessorElementForLink_Variable j = library.getContainedName('j');
     expect(j.variable.initializer, isNull);
     PropertyAccessorElementForLink_Variable v = library.getContainedName('v');
     expect(v.variable.initializer, isNotNull);
   }
 
   VariableElementForLink _getVariable(ReferenceableElementForLink element) {
     return (element as PropertyAccessorElementForLink_Variable).variable;
   }
 }