Expose caps lock state as an accessible alert

ash/common/system/chromeos/tray_caps_lock.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/common/system/chromeos/tray_caps_lock.h"
 
+#include "ash/common/accessibility_delegate.h"
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/system/tray/actionable_view.h"
 #include "ash/common/system/tray/system_tray_delegate.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/system/tray/tray_popup_utils.h"
 #include "ash/common/wm_shell.h"
 #include "ash/resources/vector_icons/vector_icons.h"
 #include "base/sys_info.h"
 #include "grit/ash_resources.h"
 #include "grit/ash_strings.h"
@@ skipping 135 matching lines @@
 TrayCapsLock::~TrayCapsLock() {
   chromeos::input_method::InputMethodManager* ime =
       chromeos::input_method::InputMethodManager::Get();
   if (ime && ime->GetImeKeyboard())
     ime->GetImeKeyboard()->RemoveObserver(this);
 }
 
 void TrayCapsLock::OnCapsLockChanged(bool enabled) {
   caps_lock_enabled_ = enabled;
 
+  // Send an a11y alert.
+  WmShell::Get()->accessibility_delegate()->TriggerAccessibilityAlert(
+      enabled ? A11Y_ALERT_CAPS_ON : A11Y_ALERT_CAPS_OFF);
+
   if (tray_view())
     tray_view()->SetVisible(caps_lock_enabled_);
 
   if (default_) {
     default_->Update(caps_lock_enabled_);
   } else {
     if (caps_lock_enabled_) {
       if (!message_shown_) {
         WmShell::Get()->RecordUserMetricsAction(
             UMA_STATUS_AREA_CAPS_LOCK_POPUP);
@@ skipping 55 matching lines @@
 
 void TrayCapsLock::DestroyDefaultView() {
   default_ = NULL;
 }
 
 void TrayCapsLock::DestroyDetailedView() {
   detailed_ = NULL;
 }
 
 }  // namespace ash