start/stop method for AudioBufferSourceNodes and OscillatorNodes can take no args.

LayoutTests/webaudio/dom-exceptions.html

Index: LayoutTests/webaudio/dom-exceptions.html
diff --git a/LayoutTests/webaudio/dom-exceptions.html b/LayoutTests/webaudio/dom-exceptions.html
index aaeaf87464a27836928a7c3e49ef223fd574739a..2725a705f1211b5438ce2ff0f06a28803db63329 100644
--- a/LayoutTests/webaudio/dom-exceptions.html
+++ b/LayoutTests/webaudio/dom-exceptions.html
@@ -117,6 +117,18 @@ function runTest() {
     // WaveShaper types
     node = context.createWaveShaper();
     shouldThrow("node.oversample = '9x'");
+
+    // Start/stop for AudioBufferSourceNodes
+    buffer = context.createBuffer(1,1, context.sampleRate);
+    shouldNotThrow("source = context.createBufferSource()");
+    source.buffer = buffer;
+    shouldNotThrow("source.start()");
+    shouldNotThrow("source.stop()");
+
+    // Start/stop for OscillatorNodes
+    shouldNotThrow("source = context.createOscillator()");
+    shouldNotThrow("source.start()");
+    shouldNotThrow("source.stop()");
 }
 
 runTest();