GUACAMOLE-905: Automatically resume AudioContext when recording starts.

The AudioContext is paused by default in Google Chrome as a defense
against autoplay. It can be explicitly resumed with resume() as long as
there has been enough interaction with the page.

guacamole-common-js/src/main/webapp/modules/AudioRecorder.js

@@ -435,6 +435,11 @@ Guacamole.RawAudioRecorder = function RawAudioRecorder(stream, mimetype) {
         source = context.createMediaStreamSource(stream);
         source.connect(processor);
 
+        // Attempt to explicitly resume AudioContext, as it may be paused
+        // by default
+        if (context.state === 'suspended')
+            context.resume();
+
         // Save stream for later cleanup
         mediaStream = stream;