Compare serialized Configs.

webrtc/modules/audio_processing/audio_processing_impl.h

Index: webrtc/modules/audio_processing/audio_processing_impl.h
diff --git a/webrtc/modules/audio_processing/audio_processing_impl.h b/webrtc/modules/audio_processing/audio_processing_impl.h
index d5e58c147a66c5ccf35f5f435f97e290cc3e4d30..64f139a4bba7f842a77e1ca7cd85b81c38db4508 100644
--- a/webrtc/modules/audio_processing/audio_processing_impl.h
+++ b/webrtc/modules/audio_processing/audio_processing_impl.h
@@ -176,15 +176,13 @@ class AudioProcessingImpl : public AudioProcessing {
   // out into a separate class with an "enabled" and "disabled" implementation.
   int WriteMessageToDebugFile();
   int WriteInitMessage();
-  int WriteConfigMessage();
-
-  // Updates |config_| and returns true if any change is made.
-  bool UpdateCurrentConfig();
+  int WriteConfigMessageIfChanged();
 
   rtc::scoped_ptr<FileWrapper> debug_file_;
   rtc::scoped_ptr<audioproc::Event> event_msg_;  // Protobuf message.
   std::string event_str_;  // Memory for protobuf serialization.
   rtc::scoped_ptr<audioproc::Config> config_;
+  std::string last_serialized_config_;
 #endif
 
   // Format of processing streams at input/output call sites.