Enable BWE logging to command line when rtc_enable_bwe_test_logging is set to true

webrtc/modules/bitrate_controller/bitrate_controller.gypi

 # Copyright (c) 2012 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.
 
 {
   'targets': [
     {
       'target_name': 'bitrate_controller',
       'type': 'static_library',
       'dependencies': [
         '<(webrtc_root)/system_wrappers/system_wrappers.gyp:system_wrappers',
       ],
       'sources': [
         'bitrate_controller_impl.cc',
         'bitrate_controller_impl.h',
         'include/bitrate_controller.h',
         'send_side_bandwidth_estimation.cc',
         'send_side_bandwidth_estimation.h',
       ],
+      'conditions': [
+        ['enable_bwe_test_logging==1', {
+          'defines': [ 'BWE_TEST_LOGGING_COMPILE_TIME_ENABLE=1' ],
+        }, {
+          'defines': [ 'BWE_TEST_LOGGING_COMPILE_TIME_ENABLE=0' ],
+        }],
+      ],
       # TODO(jschuh): Bug 1348: fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
   ], # targets
 }