Mark collection/test/priority_queue_test as slow.

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 20 matching lines @@
 collection/test/equality_test/05: Fail # Issue 1533
 collection/test/equality_test/none: Pass, Fail # Issue 14348
 third_party/angular_tests/browser_test: Pass, Slow # Large dart2js compile time
 typed_data/test/typed_buffers_test/01: Fail # Not supporting Int64List, Uint64List.
 
 [ $compiler == dart2js && $checked ]
 crypto/test/base64_test: Slow, Pass
 
 [ $compiler == dart2js && $checked && $runtime == ie9 ]
 crypto/test/base64_test: Timeout # Issue 12486
+collection/test/priority_queue_test: Pass, Slow # Issue 16426
 serialization/test/serialization_test: Skip
 
 [ $runtime == d8 || $runtime == jsshell ]
 unittest/test/unittest_nested_groups_setup_teardown_test: RuntimeError # http://dartbug.com/10109
 stack_trace/test/vm_test: RuntimeError, OK # VM-specific traces
 stack_trace/test/chain_test: Fail # Issues 15171 and 15105
 async/test/stream_zip_test: RuntimeError, OK # Timers are not supported.
 unittest/test/missing_tick_test: Fail # Timer interface not supported: dartbug.com/7728.
 
 [ $runtime == vm || $runtime == d8 || $runtime == jsshell ]
@@ skipping 276 matching lines @@
 collection/test/algorithms_test: PubGetError
 collection/test/iterable_zip_test: PubGetError
 collection/test/priority_queue_test: PubGetError
 collection/test/unmodifiable_collection_test: PubGetError
 collection/test/wrapper_test: PubGetError
 stack_trace/test/chain_test: PubGetError
 stack_trace/test/frame_test: PubGetError
 stack_trace/test/trace_test: PubGetError
 stack_trace/test/vm_test: PubGetError