Reland of Introduced new scheme for controlling the functionality inside the audio processing module

webrtc/modules/audio_processing/level_controller/level_controller_unittest.cc

Index: webrtc/modules/audio_processing/level_controller/level_controller_unittest.cc
diff --git a/webrtc/modules/audio_processing/level_controller/level_controller_unittest.cc b/webrtc/modules/audio_processing/level_controller/level_controller_unittest.cc
index c470c2fad7b5bd4c2371bbf49e4e1322141d49a2..f5cea0dbccd9357717d634c9d4e1862b742ffc4d 100644
--- a/webrtc/modules/audio_processing/level_controller/level_controller_unittest.cc
+++ b/webrtc/modules/audio_processing/level_controller/level_controller_unittest.cc
@@ -68,6 +68,25 @@ void RunBitexactnessTest(int sample_rate_hz,
 
 }  // namespace
 
+TEST(LevelControlConfigTest, ToStringEnabled) {
+  AudioProcessing::Config config;
+  config.level_controller.enabled = true;
+  EXPECT_EQ("{enabled: true}",
+            LevelController::ToString(config.level_controller));
+}
+
+TEST(LevelControlConfigTest, ToStringNotEnabled) {
+  AudioProcessing::Config config;
+  config.level_controller.enabled = false;
+  EXPECT_EQ("{enabled: false}",
+            LevelController::ToString(config.level_controller));
+}
+
+TEST(LevelControlConfigTest, DefaultValue) {
+  AudioProcessing::Config config;
+  EXPECT_FALSE(config.level_controller.enabled);
+}
+
 TEST(LevelControlBitExactnessTest, DISABLED_Mono8kHz) {
   const float kOutputReference[] = {-0.013939f, -0.012154f, -0.009054f};
   RunBitexactnessTest(AudioProcessing::kSampleRate8kHz, 1,