Adds armv5 build and test target.

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 145 matching lines @@
 http_server/test/*: Fail, OK # Uses dart:io.
 observe/test/transformer_test: Fail, OK # Uses dart:io.
 observe/test/unique_message_test: SkipByDesign  # Uses dart:io.
 stub_core_library/test/*: Fail, OK # Uses dart:io.
 third_party/angular_tests/browser_test/core_dom/cookies: Fail # Issue 16337
 third_party/angular_tests/vm_test: SkipByDesign # Uses dart:io
 third_party/html5lib/test/parser_test: SkipByDesign # Uses dart:io.
 third_party/html5lib/test/selectors/*: SkipByDesign # Uses dart:io.
 third_party/html5lib/test/tokenizer_test: SkipByDesign # Uses dart:io.
 
-[ $arch == simarm64 ]
+[ $arch == simarm64 || $arch == armv5 ]
 # Timeout. These are not unit tests. They do not run efficiently on our
-# simulator.
+# simulator or low-end devices.
 *: Skip
 
 [ $runtime == vm ]
 # Skip tests on the VM if the package depends on dart:html
 mutation_observer: Skip
 third_party/html5lib/test/browser/browser_test: Skip
 
 [ $compiler == dartanalyzer || $compiler == dart2analyzer ]
 third_party/angular_tests/vm_test: StaticWarning # Uses removed APIs. See issue 18733.
 
 [ $runtime == safari || $runtime == safarimobilesim || $runtime == chrome || $runtime == ff || $ie ]
 # Various issues due to limited browser testing in Angular.
 third_party/angular_tests/*: Skip
 
 [ $compiler == dart2js && $runtime == chrome && $system == macos ]
 third_party/di_tests/di_test: Pass, Slow # Issue 22896
 
 [ $unchecked ]
 third_party/angular_tests/browser_test/angular: SkipByDesign # Requires checked mode.
 third_party/angular_tests/browser_test/core/scope: SkipByDesign # Requires checked mode.
 third_party/angular_tests/browser_test/core/zone: SkipByDesign # 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