Adds setting subject and adding event on receiving such change.

modules/API/API.js

@@ -63,6 +63,10 @@ function initCommands() {
         'proxy-connection-event': event => {
             APP.conference.onProxyConnectionEvent(event);
         },
+        'subject': subject => {
+            sendAnalytics(createApiEvent('subject.changed'));
+            APP.conference.setSubject(subject);
+        },
         'submit-feedback': feedback => {
             sendAnalytics(createApiEvent('submit.feedback'));
             APP.conference.submitFeedback(feedback.score, feedback.message);
@@ -551,6 +555,20 @@ class API {
         });
     }
 
+    /**
+     * Notify external application (if API is enabled) that the conference
+     * changed their subject.
+     *
+     * @param {string} subject - Conference subject.
+     * @returns {void}
+     */
+    notifySubjectChanged(subject: string) {
+        this._sendEvent({
+            name: 'subject-change',
+            subject
+        });
+    }
+
     /**
      * Disposes the allocated resources.
      *