Add comments to clarify argument meanings in APM impl test

Bug: webrtc:10608
Change-Id: Iac1111b739458a1b0ce1cac5e59de06905c085d2
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/135574
Commit-Queue: Fredrik Hernqvist <fhernqvist@webrtc.org>
Reviewed-by: Alessio Bazzica <alessiob@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27891}
diff --git a/modules/audio_processing/audio_processing_impl_unittest.cc b/modules/audio_processing/audio_processing_impl_unittest.cc
index 69fc779..7359f6b 100644
--- a/modules/audio_processing/audio_processing_impl_unittest.cc
+++ b/modules/audio_processing/audio_processing_impl_unittest.cc
@@ -240,11 +240,15 @@
   MockEchoControl* echo_control_mock = echo_control_factory_ptr->GetNext();
 
   EXPECT_CALL(*echo_control_mock, AnalyzeCapture(NotNull())).Times(1);
-  EXPECT_CALL(*echo_control_mock, ProcessCapture(NotNull(), false)).Times(1);
+  EXPECT_CALL(*echo_control_mock,
+              ProcessCapture(NotNull(), /*echo_path_change=*/false))
+      .Times(1);
   apm->ProcessStream(&frame);
 
   EXPECT_CALL(*echo_control_mock, AnalyzeCapture(NotNull())).Times(1);
-  EXPECT_CALL(*echo_control_mock, ProcessCapture(NotNull(), true)).Times(1);
+  EXPECT_CALL(*echo_control_mock,
+              ProcessCapture(NotNull(), /*echo_path_change=*/true))
+      .Times(1);
   apm->SetRuntimeSetting(
       AudioProcessing::RuntimeSetting::CreateCapturePreGain(2.f));
   apm->ProcessStream(&frame);