Add a noise indicator to the speech bubble volume indicator.

content/browser/speech/speech_recognizer.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_SPEECH_RECOGNIZER_H_
 #define CONTENT_BROWSER_SPEECH_SPEECH_RECOGNIZER_H_
 
 #include <list>
 #include <string>
 #include <utility>
@@ skipping 47 matching lines @@
                                    SpeechRecognizer::ErrorCode error) = 0;
 
     // At the start of recognition, a short amount of audio is recorded to
     // estimate the environment/background noise and this callback is issued
     // after that is complete. Typically the delegate brings up any speech
     // recognition UI once this callback is received.
     virtual void DidCompleteEnvironmentEstimation(int caller_id) = 0;
 
     // Informs of a change in the captured audio level, useful if displaying
     // a microphone volume indicator while recording.
-    // The value of |volume| is in the [0.0, 1.0] range.
-    virtual void SetInputVolume(int caller_id, float volume) = 0;
+    // The value of |volume| and |noise_volume| is in the [0.0, 1.0] range.
+    virtual void SetInputVolume(int caller_id, float volume,
+                                float noise_volume) = 0;
 
    protected:
     virtual ~Delegate() {}
   };
 
   SpeechRecognizer(Delegate* delegate,
                    int caller_id,
                    const std::string& language,
                    const std::string& grammar,
                    const std::string& hardware_info,
@@ skipping 62 matching lines @@
 
 // This typedef is to workaround the issue with certain versions of
 // Visual Studio where it gets confused between multiple Delegate
 // classes and gives a C2500 error. (I saw this error on the try bots -
 // the workaround was not needed for my machine).
 typedef SpeechRecognizer::Delegate SpeechRecognizerDelegate;
 
 }  // namespace speech_input
 
 #endif  // CONTENT_BROWSER_SPEECH_SPEECH_RECOGNIZER_H_