Add a noise indicator to the speech bubble volume indicator.

content/browser/speech/speech_recognizer.h

Index: content/browser/speech/speech_recognizer.h
diff --git a/content/browser/speech/speech_recognizer.h b/content/browser/speech/speech_recognizer.h
index a54a59ddf9285e0d3583b7033f26f29dd87c0c6b..f8df0c20312bb6ea9d5544766b3313752f99defe 100644
--- a/content/browser/speech/speech_recognizer.h
+++ b/content/browser/speech/speech_recognizer.h
@@ -65,8 +65,9 @@ class SpeechRecognizer
 
     // 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() {}