Enable proxy_unittest (thread proxy tests).

webrtc/api/api_tests.gyp

 # Copyright (c) 2015 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.
 
 {
   'includes': [ '../build/common.gypi', ],
@@ skipping 25 matching lines @@
         'fakemetricsobserver.cc',
         'fakemetricsobserver.h',
         'jsepsessiondescription_unittest.cc',
         'localaudiosource_unittest.cc',
         'mediaconstraintsinterface_unittest.cc',
         'mediastream_unittest.cc',
         'peerconnection_unittest.cc',
         'peerconnectionendtoend_unittest.cc',
         'peerconnectionfactory_unittest.cc',
         'peerconnectioninterface_unittest.cc',
-        # 'peerconnectionproxy_unittest.cc',
+        'proxy_unittest.cc',
         'rtpsenderreceiver_unittest.cc',
         'statscollector_unittest.cc',
         'test/fakeaudiocapturemodule.cc',
         'test/fakeaudiocapturemodule.h',
         'test/fakeaudiocapturemodule_unittest.cc',
         'test/fakeconstraints.h',
         'test/fakedatachannelprovider.h',
         'test/fakedtlsidentitystore.h',
         'test/fakeperiodicvideocapturer.h',
         'test/fakevideotrackrenderer.h',
@@ skipping 132 matching lines @@
             '../build/isolate.gypi',
           ],
           'sources': [
             'peerconnection_unittests.isolate',
           ],
         },
       ],  # targets
     }],  # test_isolation_mode != "noop"
   ],  # conditions
 }