Support for providing media stream audio track to speech recognition

public/web/WebSpeechRecognizer.h

Index: public/web/WebSpeechRecognizer.h
diff --git a/public/web/WebSpeechRecognizer.h b/public/web/WebSpeechRecognizer.h
index 91ec0579a2ab5e0d445150c1b232340e5c16fe61..b79172c5c1fccc5dc532720f866606bcee6905db 100644
--- a/public/web/WebSpeechRecognizer.h
+++ b/public/web/WebSpeechRecognizer.h
@@ -31,6 +31,7 @@
 
 namespace blink {
 
+class WebMediaStreamTrack;
 class WebSpeechGrammar;
 class WebSpeechRecognitionParams;
 class WebSpeechRecognizerClient;
@@ -38,6 +39,12 @@ class WebSpeechRecognizerClient;
 // Interface for speech recognition, to be implemented by the embedder.
 class WebSpeechRecognizer {
 public:
+    // Attach an audio track for recognition instead of default input
+    virtual void attach(const WebSpeechRecognitionHandle&, const WebMediaStreamTrack& audioTrack, WebSpeechRecognizerClient*) { BLINK_ASSERT_NOT_REACHED(); }
+
+    // Detach the audiotrack (if attached) for recognition - fall back to default input
+    virtual void detach(const WebSpeechRecognitionHandle&, WebSpeechRecognizerClient*) { BLINK_ASSERT_NOT_REACHED(); }
+
     // Start speech recognition for the specified handle using the specified parameters. Notifications on progress, results, and errors will be sent via the client.
     virtual void start(const WebSpeechRecognitionHandle&, const WebSpeechRecognitionParams&, WebSpeechRecognizerClient*) { BLINK_ASSERT_NOT_REACHED(); }