Support aria-modal in ChromeVox

Bug: 800948
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Ia0a314d12ad121dd5748bbeb2ab5213920772d16
Reviewed-on: https://chromium-review.googlesource.com/881956Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532010}

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

@@ -338,7 +338,7 @@ AutomationPredicate.root = function(node) {
           (node.parent.root.role == Role.DESKTOP &&
            node.parent.role == Role.WEB_VIEW);
     default:
-      return false;
+      return !!node.modal;
   }
 };
 

chrome/common/extensions/api/automation.idl

@@ -650,6 +650,9 @@
     // The name of the programmatic backing object.
     DOMString? className;
 
+    // Marks this subtree as modal.
+    boolean? modal;
+
     // A map containing all HTML attributes and their values
     // <jsexterns>@type {Object<string>}</jsexterns>
     object? htmlAttributes;

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

@@ -852,6 +852,7 @@ var boolAttributes = [
     'containerLiveAtomic',
     'containerLiveBusy',
     'liveAtomic',
+    'modal',
     'scrollable'
 ];
 

third_party/closure_compiler/externs/automation.js

@@ -907,6 +907,13 @@ chrome.automation.AutomationNode.prototype.autoComplete;
  */
 chrome.automation.AutomationNode.prototype.className;
 
+/**
+ * Marks this subtree as modal.
+ * @type {(boolean|undefined)}
+ * @see https://developer.chrome.com/extensions/automation#type-modal
+ */
+chrome.automation.AutomationNode.prototype.modal;
+
 /**
  * A map containing all HTML attributes and their values
  * @type {Object<string>}