dart2js: Support isDeferred on DependencyMirrors.

pkg/pkg.status

 # 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.
 
 # Don't run any test-like files that show up in packages directories. It
 # shouldn't be necessary to run "pub install" in these packages, but if you do
 # it shouldn't break the tests.
 */packages/*/*: Skip
 */*/packages/*/*: Skip
 */*/*/packages/*/*: Skip
@@ skipping 168 matching lines @@
 
 [ $browser ]
 docgen/test/*: Skip  # Uses dart:io
 
 [ $compiler == dartanalyzer || $compiler == dart2analyzer ]
 third_party/angular_tests/vm_test: StaticWarning # Uses removed APIs. See issue 18733.
 analyzer2dart/test/driver_test: StaticWarning # Issue 22418
 analyzer2dart/test/sexpr_test: StaticWarning # Issue 22418
 analyzer2dart/test/tree_shaker_test: StaticWarning # Issue 22418
 analyzer2dart/test/end2end_test: StaticWarning # Issue 22418
-docgen/test/multi_library_test: StaticWarning # Issue 22475
-docgen/test/method_param_test: StaticWarning # Issue 22475
-docgen/test/async_await_test: StaticWarning # Issue 22475
-docgen/test/typedef_test: StaticWarning # Issue 22475
-docgen/test/metadata_test: StaticWarning # Issue 22475
-docgen/test/native_extensions_test: StaticWarning # Issue 22475
-docgen/test/generate_json_test: StaticWarning # Issue 22475
-docgen/test/only_lib_content_in_pkg_test: StaticWarning # Issue 22475
-docgen/test/constant_argument_test: StaticWarning # Issue 22475
-docgen/test/inherited_comments_test: StaticWarning # Issue 22475
-docgen/test/single_library_test: StaticWarning # Issue 22475
 
 [ $runtime == safari || $runtime == safarimobilesim || $runtime == chrome || $runtime == ff || $ie ]
 # Various issues due to limited browser testing in Angular.
 third_party/angular_tests/*: Skip
 
 [ $unchecked ]
 third_party/angular_tests/browser_test/angular: Skip # Requires checked mode.
 third_party/angular_tests/browser_test/core/scope: Skip # Requires checked mode.
 third_party/angular_tests/browser_test/core/zone: Skip # Requires checked mode.
 third_party/angular_tests/browser_test/directive/ng_repeat: Skip # Issue 17152
 third_party/angular_tests/browser_test/change_detection/dirty_checking_change_detector: Skip # Issue 17152
 
 [ $use_repository_packages ]
 analyzer/test/*: PubGetError