Add tests and fix thread annotations

webrtc/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.
 
 # TODO(kjellander): Rebase this to webrtc/build/common.gypi changes after r6330.
 
@@ skipping 387 matching lines @@
       "base/stream_unittest.cc",
       "base/stringencode_unittest.cc",
       "base/stringutils_unittest.cc",
       "base/swap_queue_unittest.cc",
 
       # TODO(ronghuawu): Reenable this test.
       # "systeminfo_unittest.cc",
       "base/task_queue_unittest.cc",
       "base/task_unittest.cc",
       "base/testclient_unittest.cc",
+      "base/thread_annotations_unittest.cc",
       "base/thread_checker_unittest.cc",
       "base/thread_unittest.cc",
       "base/timestampaligner_unittest.cc",
       "base/timeutils_unittest.cc",
       "base/urlencode_unittest.cc",
       "base/weak_ptr_unittest.cc",
 
       # TODO(ronghuawu): Reenable this test.
       # "windowpicker_unittest.cc",
       "p2p/base/asyncstuntcpsocket_unittest.cc",
@@ skipping 395 matching lines @@
 
       deps = [
         "//base:base_java_test_support",
         "//webrtc/api:libjingle_peerconnection_java",
         "//webrtc/api:libjingle_peerconnection_jni",
         "//webrtc/examples:AppRTCMobile_javalib",
       ]
     }
   }
 }