Add a noise indicator to the speech bubble volume indicator.

content/browser/speech/endpointer/endpointer.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_SPEECH_ENDPOINTER_ENDPOINTER_H_
 #define CONTENT_BROWSER_SPEECH_ENDPOINTER_ENDPOINTER_H_
 
 #include "base/basictypes.h"
 #include "content/browser/speech/endpointer/energy_endpointer.h"
 
@@ skipping 78 matching lines @@
   }
 
   void set_long_speech_length(int64 time_us) {
     long_speech_length_us_ = time_us;
   }
 
   bool speech_input_complete() const {
     return speech_input_complete_;
   }
 
+  // RMS background noise level in dB.
+  float NoiseLevelDb() const { return energy_endpointer_.GetNoiseLevelDb(); }
+
  private:
   // Reset internal states. Helper method common to initial input utterance
   // and following input utternaces.
   void Reset();
 
   // Minimum allowable length of speech input.
   int64 speech_input_minimum_length_us_;
 
   // The speechInputPossiblyComplete event signals that silence/noise has been
   // detected for a *short* amount of time after some speech has been detected.
@@ skipping 30 matching lines @@
   bool speech_previously_detected_;
   bool speech_input_complete_;
   EnergyEndpointer energy_endpointer_;
   int sample_rate_;
   int32 frame_size_;
 };
 
 }  // namespace speech_input
 
 #endif  // CONTENT_BROWSER_SPEECH_ENDPOINTER_ENDPOINTER_H_