Fix Chrome OS virtual keyboard accessibility

chrome/browser/ui/aura/accessibility/automation_manager_aura.h

Index: chrome/browser/ui/aura/accessibility/automation_manager_aura.h
diff --git a/chrome/browser/ui/aura/accessibility/automation_manager_aura.h b/chrome/browser/ui/aura/accessibility/automation_manager_aura.h
index ecb3c605e19d5cc621376d17495cb4aa292e8cda..c6ec8a1cd6a2be3fb17e779d432c2fca389b698b 100644
--- a/chrome/browser/ui/aura/accessibility/automation_manager_aura.h
+++ b/chrome/browser/ui/aura/accessibility/automation_manager_aura.h
@@ -62,6 +62,8 @@ class AutomationManagerAura : public ui::AXHostDelegate,
 
   // views::AXAuraObjCache::Delegate implementation.
   void OnChildWindowRemoved(views::AXAuraObjWrapper* parent) override;
+  void OnEvent(views::AXAuraObjWrapper* aura_obj,
+               ui::AXEvent event_type) override;
 
  protected:
   AutomationManagerAura();
@@ -70,6 +72,8 @@ class AutomationManagerAura : public ui::AXHostDelegate,
  private:
   friend struct base::DefaultSingletonTraits<AutomationManagerAura>;
 
+  FRIEND_TEST_ALL_PREFIXES(AutomationManagerAuraBrowserTest, WebAppearsOnce);
+
   // Reset state in this manager. If |reset_serializer| is true, reset the
   // serializer to save memory.
   void Reset(bool reset_serializer);