Add the option of compressing speech input audio using FLAC.

chrome/browser/speech/speech_recognizer.h

Index: chrome/browser/speech/speech_recognizer.h
diff --git a/chrome/browser/speech/speech_recognizer.h b/chrome/browser/speech/speech_recognizer.h
index cafba287f57fea63a0f3b691f93e15cca79a0ffd..5e8511f596e8c26fcc52649d23916c70bdec79a9 100644
--- a/chrome/browser/speech/speech_recognizer.h
+++ b/chrome/browser/speech/speech_recognizer.h
@@ -11,14 +11,13 @@
 
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
+#include "chrome/browser/speech/audio_encoder.h"
 #include "chrome/browser/speech/endpointer/endpointer.h"
 #include "chrome/browser/speech/speech_recognition_request.h"
 #include "media/audio/audio_input_controller.h"
 
 namespace speech_input {
 
-class SpeexEncoder;
-
 // Records audio, sends recorded audio to server and translates server response
 // to recognition result.
 class SpeechRecognizer
@@ -128,13 +127,10 @@ class SpeechRecognizer
   std::string grammar_;
   std::string hardware_info_;
 
-  // Buffer holding the recorded audio. Owns the strings inside the list.
-  typedef std::list<std::string*> AudioBufferQueue;
-  AudioBufferQueue audio_buffers_;
-
   scoped_ptr<SpeechRecognitionRequest> request_;
   scoped_refptr<media::AudioInputController> audio_controller_;
-  scoped_ptr<SpeexEncoder> encoder_;
+  AudioEncoder::Codec codec_;
+  scoped_ptr<AudioEncoder> encoder_;
   Endpointer endpointer_;
   int num_samples_recorded_;
   float audio_level_;