Add MediaCodecAudioDecoder implementation

media/base/decoder_buffer.cc

Index: media/base/decoder_buffer.cc
diff --git a/media/base/decoder_buffer.cc b/media/base/decoder_buffer.cc
index 621ba00539a3d3a4d55611f7290d2a958aeab9fc..ec0d01b29b776d938b3fb185b00290f5c8ae9227 100644
--- a/media/base/decoder_buffer.cc
+++ b/media/base/decoder_buffer.cc
@@ -99,6 +99,21 @@ std::string DecoderBuffer::AsHumanReadableString() {
   return s.str();
 }
 
+std::string DecoderBuffer::AsShortString() {
+  if (end_of_stream()) {
+    return "EOS";
+  }
+
+  std::ostringstream s;
+  s << "timestamp: " << timestamp_;
+  if (is_key_frame_)
+    s << " KEY";
+  if (decrypt_config_)
+    s << " decrypt:" << (*decrypt_config_);
+
+  return s.str();
+}
+
 void DecoderBuffer::set_timestamp(base::TimeDelta timestamp) {
   DCHECK(!end_of_stream());
   timestamp_ = timestamp;