Use SingleThreadedTaskQueue in DirectTransport

webrtc/test/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("../webrtc.gni")
 import("//build/config/ui.gni")
@@ skipping 269 matching lines @@
       "../modules/rtp_rtcp",
       "../rtc_base:rtc_base_approved",
       "../system_wrappers",
     ]
     sources = [
       "fake_audio_device_unittest.cc",
       "fake_network_pipe_unittest.cc",
       "frame_generator_unittest.cc",
       "rtp_file_reader_unittest.cc",
       "rtp_file_writer_unittest.cc",
+      "single_threaded_task_queue_unittest.cc",
       "testsupport/always_passing_unittest.cc",
       "testsupport/metrics/video_metrics_unittest.cc",
       "testsupport/packet_reader_unittest.cc",
       "testsupport/perf_test_unittest.cc",
       "testsupport/test_output_unittest.cc",
       "testsupport/y4m_frame_writer_unittest.cc",
       "testsupport/yuv_frame_reader_unittest.cc",
       "testsupport/yuv_frame_writer_unittest.cc",
     ]
 
@@ skipping 96 matching lines @@
     suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
   }
   deps = [
     "..:webrtc_common",
     "../api:transport_api",
     "../call",
     "../modules/rtp_rtcp",
     "../rtc_base:rtc_base_approved",
     "../system_wrappers",
   ]
+  public_deps = [
+    ":single_threaded_task_queue",
+  ]
+}
+
+rtc_source_set("single_threaded_task_queue") {
+  testonly = true
+  sources = [
+    "single_threaded_task_queue.cc",
+    "single_threaded_task_queue.h",
+  ]
+  deps = [
+    "../rtc_base:rtc_base_approved",
+  ]
 }
 
 rtc_source_set("fake_audio_device") {
   testonly = true
   sources = [
     "fake_audio_device.cc",
     "fake_audio_device.h",
   ]
   if (!build_with_chromium && is_clang) {
     # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
@@ skipping 191 matching lines @@
     java_files = [
       "android/org/webrtc/native_test/RTCNativeUnitTest.java",
       "android/org/webrtc/native_test/RTCNativeUnitTestActivity.java",
     ]
     deps = [
       "../rtc_base:base_java",
       "//testing/android/native_test:native_test_java",
     ]
   }
 }