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..1f79fdd942223f85f2b97f329ede2b2afbbc01dd 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;
@@ -41,6 +42,9 @@ public:
     // 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(); }
 
+    // Start as above with the addition of using a WebMediaStreamTrack as the audio track.
+    virtual void start(const WebSpeechRecognitionHandle&, const WebSpeechRecognitionParams&, const WebMediaStreamTrack& audioTrack, WebSpeechRecognizerClient*) { BLINK_ASSERT_NOT_REACHED(); }
+
     // Stop speech recognition for the specified handle, returning any results for the audio recorded so far. Notifications and errors are sent via the client.
     virtual void stop(const WebSpeechRecognitionHandle&, WebSpeechRecognizerClient*) { BLINK_ASSERT_NOT_REACHED(); }