Fix building of bwe_test_logging.cc in gyp and gn builds

bwe_test_logging.cc is supposed to be conditionally built in gyp builds
but, due to a path error in the sources! expressions it was always
compiled.

Meanwhile, compilation of bwe_test_logging.cc was never set up for gn
builds.

This fixes both of these problems.

BUG=604060

Review-Url: https://codereview.webrtc.org/1990373002
Cr-Commit-Position: refs/heads/master@{#12842}

webrtc/modules/remote_bitrate_estimator/BUILD.gn

@@ -6,6 +6,11 @@
 # 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",
@@ -41,6 +46,10 @@ source_set("rbe_components") {
     "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/modules/remote_bitrate_estimator/remote_bitrate_estimator.gypi

@@ -48,7 +48,7 @@
         }, {
           'defines': [ 'BWE_TEST_LOGGING_COMPILE_TIME_ENABLE=0' ],
           'sources!': [
-            'remote_bitrate_estimator/test/bwe_test_logging.cc'
+            'test/bwe_test_logging.cc'
           ],
         }],
       ],
@@ -99,7 +99,7 @@
             }, {
               'defines': [ 'BWE_TEST_LOGGING_COMPILE_TIME_ENABLE=0' ],
               'sources!': [
-                'remote_bitrate_estimator/test/bwe_test_logging.cc'
+                'test/bwe_test_logging.cc'
               ],
             }],
           ],