Fix reading of menus.

This broke because menuItems are not the descendants of the currently focused item.
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2028793002
Cr-Commit-Position: refs/heads/master@{#396959}

chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js

@@ -365,8 +365,10 @@ DesktopAutomationHandler.prototype = {
     chrome.automation.getFocus(function(focus) {
       // Some cases (e.g. in overview mode), require overriding the assumption
       // that focus is an ancestor of a selection target.
-      var override =
-          evt.target.root == focus.root && focus.root.role == RoleType.desktop;
+      var override = evt.target.role == RoleType.menuItem ||
+          (evt.target.root == focus.root &&
+              focus.root.role == RoleType.desktop);
+      Output.flushNextSpeechUtterance();
       if (override || AutomationUtil.isDescendantOf(evt.target, focus))
         this.onEventDefault(evt);
     }.bind(this));