Support role description in automation/ChromeVox

third_party/closure_compiler/externs/automation.js

Index: third_party/closure_compiler/externs/automation.js
diff --git a/third_party/closure_compiler/externs/automation.js b/third_party/closure_compiler/externs/automation.js
index 2028d33912f95ff023e2090c7c5557d9f95e2be1..128d92feb3eaf68d198f9a6ba9be246ed995741b 100644
--- a/third_party/closure_compiler/externs/automation.js
+++ b/third_party/closure_compiler/externs/automation.js
@@ -434,6 +434,13 @@ chrome.automation.AutomationNode.prototype.description;
  */
 chrome.automation.AutomationNode.prototype.placeholder;
 
+/**
+ * The role description for this node.
+ * @type {(string|undefined)}
+ * @see https://developer.chrome.com/extensions/automation#type-roleDescription
+ */
+chrome.automation.AutomationNode.prototype.roleDescription;
+
 /**
  * The accessible name for this node, via the <a href="http://www.w3.org/TR/wai-aria/roles#namecalculation"> Accessible Name Calculation</a> process.
  * @type {(string|undefined)}