Expose media controls to accessibility

chrome/renderer/resources/extensions/automation/automation_node.js

Index: chrome/renderer/resources/extensions/automation/automation_node.js
diff --git a/chrome/renderer/resources/extensions/automation/automation_node.js b/chrome/renderer/resources/extensions/automation/automation_node.js
index 54c308a33cd20544c1735c75d89f2e185224811b..85a78e1d29a57b36e4f6cbc740820d9a639e2746 100644
--- a/chrome/renderer/resources/extensions/automation/automation_node.js
+++ b/chrome/renderer/resources/extensions/automation/automation_node.js
@@ -394,6 +394,14 @@ AutomationNodeImpl.prototype = {
     this.performAction_('showContextMenu');
   },
 
+  startDucking: function() {
+    this.performAction_('startDucking');
+  },
+
+  stopDucking: function() {
+    this.performAction_('stopDucking');
+  },
+
   domQuerySelector: function(selector, callback) {
     if (!this.rootImpl)
       callback();
@@ -1075,6 +1083,8 @@ utils.expose(AutomationNode, AutomationNodeImpl, {
     'setSelection',
     'setSequentialFocusNavigationStartingPoint',
     'showContextMenu',
+    'startDucking',
+    'stopDucking',
     'addEventListener',
     'removeEventListener',
     'domQuerySelector',