Support role description in automation/ChromeVox

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

Index: chrome/browser/resources/chromeos/chromevox/cvox2/background/automation_predicate.js
diff --git a/chrome/browser/resources/chromeos/chromevox/cvox2/background/automation_predicate.js b/chrome/browser/resources/chromeos/chromevox/cvox2/background/automation_predicate.js
index 717e78e7845308509d90b65b5791e526ed18be2c..866cd0e4d6a39001f4f2a24b0fb23b5eeef8fc99 100644
--- a/chrome/browser/resources/chromeos/chromevox/cvox2/background/automation_predicate.js
+++ b/chrome/browser/resources/chromeos/chromevox/cvox2/background/automation_predicate.js
@@ -278,7 +278,7 @@ AutomationPredicate.linebreak = function(first, second) {
 AutomationPredicate.container = function(node) {
   return AutomationPredicate.match({
     anyRole: [
-      Role.DIV,

[dmazzoni, 2017/06/02 19:55:24]

Why didn't the compile fail when DIV was removed?

Is our presubmit only one-way, i.e. it catches
additions but not deletions?

[David Tseng, 2017/06/02 21:34:34]

No, it has to do with the externs not being re-generated when you edit an idl
file.
Since it wasn't re-generated, the externs still had the old DIV role...

[michaelpg, 2017/06/03 00:01:35]

Add automation.idl to api_pair_names:
https://cs.chromium.org/chromium/src/chrome/common/extensions/api/PRESUBMIT.p....

+      Role.GENERIC_CONTAINER,
       Role.DOCUMENT,
       Role.GROUP,
       Role.LIST_ITEM,
@@ -372,7 +372,7 @@ AutomationPredicate.shouldIgnoreNode = function(node) {
   return AutomationPredicate.leaf(node) &&
       (AutomationPredicate.roles([Role.CLIENT,
                                   Role.COLUMN,
-                                  Role.DIV,
+                                  Role.GENERIC_CONTAINER,
                                   Role.GROUP,
                                   Role.IMAGE,
                                   Role.STATIC_TEXT,