Complete live region support in ChromeVox Next.

chrome/renderer/resources/extensions/automation_custom_bindings.js

Index: chrome/renderer/resources/extensions/automation_custom_bindings.js
diff --git a/chrome/renderer/resources/extensions/automation_custom_bindings.js b/chrome/renderer/resources/extensions/automation_custom_bindings.js
index 1d8c13f4bf5d7b401569793d6f92ba93ae21e5a8..bfc201a7de2f0e8a60cb9c17631b988c21e1e5aa 100644
--- a/chrome/renderer/resources/extensions/automation_custom_bindings.js
+++ b/chrome/renderer/resources/extensions/automation_custom_bindings.js
@@ -22,6 +22,8 @@ var DestroyAccessibilityTree =
 var GetIntAttribute = nativeAutomationInternal.GetIntAttribute;
 var StartCachingAccessibilityTrees =
     nativeAutomationInternal.StartCachingAccessibilityTrees;
+var SetTreeChangeObserverMask =
+    nativeAutomationInternal.SetTreeChangeObserverMask;
 var schema = GetSchemaAdditions();
 
 /**
@@ -128,6 +130,14 @@ automation.registerCustomHook(function(bindingsAPI) {
     addTreeChangeObserver(observer);
   });
 
+  function setTreeChangeObserverMask(mask) {
+    SetTreeChangeObserverMask(mask);
+  }
+  apiFunctions.setHandleRequest('setTreeChangeObserverMask',
+      function(mask) {
+        setTreeChangeObserverMask(mask);
+      });
+
   apiFunctions.setHandleRequest('setDocumentSelection', function(params) {
     var anchorNodeImpl = privates(params.anchorObject).impl;
     var focusNodeImpl = privates(params.focusObject).impl;