Fix building of bwe_test_logging.cc in gyp and gn builds

webrtc/modules/remote_bitrate_estimator/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.
 
+declare_args() {
+  # Set this to true to enable BWE test logging.
+  enable_bwe_test_logging = false
+}
+
 source_set("remote_bitrate_estimator") {
   sources = [
     "include/bwe_defines.h",
     "include/remote_bitrate_estimator.h",
   ]
 
   configs += [ "../../:common_inherited_config" ]
 
   deps = [
     ":rbe_components",
@@ skipping 15 matching lines @@
     "overuse_estimator.h",
     "remote_bitrate_estimator_abs_send_time.cc",
     "remote_bitrate_estimator_single_stream.cc",
     "remote_estimator_proxy.cc",
     "remote_estimator_proxy.h",
     "send_time_history.cc",
     "transport_feedback_adapter.cc",
     "transport_feedback_adapter.h",
   ]
 
+  if (enable_bwe_test_logging) {
+    sources += [ "test/bwe_test_logging.cc" ]
+  }
+
   configs += [ "../..:common_config" ]
   public_configs = [ "../..:common_inherited_config" ]
   deps = [
     "../..:webrtc_common",
   ]
 
   if (is_clang) {
     # Suppress warnings from Chrome's Clang plugins.
     # See http://code.google.com/p/webrtc/issues/detail?id=163 for details.
     configs -= [ "//build/config/clang:find_bad_constructs" ]
   }
 }