Add encode/decode time tracing to audio_coding.

webrtc/modules/audio_coding/codecs/audio_decoder.h

Index: webrtc/modules/audio_coding/codecs/audio_decoder.h
diff --git a/webrtc/modules/audio_coding/codecs/audio_decoder.h b/webrtc/modules/audio_coding/codecs/audio_decoder.h
index 25a77ac3931ed40ba784e7a96dc4844ef1a867d9..81ac87318300bf430ea55886fba8443e554adef7 100644
--- a/webrtc/modules/audio_coding/codecs/audio_decoder.h
+++ b/webrtc/modules/audio_coding/codecs/audio_decoder.h
@@ -41,21 +41,21 @@ class AudioDecoder {
   // is set to kComfortNoise, otherwise it is kSpeech. The desired output
   // sample rate is provided in |sample_rate_hz|, which must be valid for the
   // codec at hand.
-  virtual int Decode(const uint8_t* encoded,
-                     size_t encoded_len,
-                     int sample_rate_hz,
-                     size_t max_decoded_bytes,
-                     int16_t* decoded,
-                     SpeechType* speech_type);
+  int Decode(const uint8_t* encoded,
+             size_t encoded_len,
+             int sample_rate_hz,
+             size_t max_decoded_bytes,
+             int16_t* decoded,
+             SpeechType* speech_type);
 
   // Same as Decode(), but interfaces to the decoders redundant decode function.
   // The default implementation simply calls the regular Decode() method.
-  virtual int DecodeRedundant(const uint8_t* encoded,
-                              size_t encoded_len,
-                              int sample_rate_hz,
-                              size_t max_decoded_bytes,
-                              int16_t* decoded,
-                              SpeechType* speech_type);
+  int DecodeRedundant(const uint8_t* encoded,
+                      size_t encoded_len,
+                      int sample_rate_hz,
+                      size_t max_decoded_bytes,
+                      int16_t* decoded,
+                      SpeechType* speech_type);
 
   // Indicates if the decoder implements the DecodePlc method.
   virtual bool HasDecodePlc() const;
@@ -107,7 +107,7 @@ class AudioDecoder {
                              size_t encoded_len,
                              int sample_rate_hz,
                              int16_t* decoded,
-                             SpeechType* speech_type);
+                             SpeechType* speech_type) = 0;
 
   virtual int DecodeRedundantInternal(const uint8_t* encoded,
                                       size_t encoded_len,