Wire up an api to darken screen for accessibility

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

 // Copyright 2014 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 "chrome/browser/ui/aura/accessibility/automation_manager_aura.h"
 
 #include <stddef.h>
 
 #include "base/memory/singleton.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/api/automation_internal/automation_event_router.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/common/extensions/api/automation_api_constants.h"
 #include "chrome/common/extensions/chrome_extension_messages.h"
 #include "content/public/browser/ax_event_notification_details.h"
 #include "content/public/browser/browser_context.h"
 #include "ui/accessibility/ax_action_data.h"
 #include "ui/accessibility/ax_enums.h"
 #include "ui/accessibility/ax_tree_id_registry.h"
 #include "ui/aura/env.h"
 #include "ui/aura/window.h"
 #include "ui/views/accessibility/ax_aura_obj_wrapper.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
 #if defined(OS_CHROMEOS)
 #include "ash/wm/window_util.h"  // nogncheck
+#include "chromeos/dbus/dbus_thread_manager.h"
+#include "chromeos/dbus/power_manager_client.h"
 #endif
 
 using content::BrowserContext;
 using extensions::AutomationEventRouter;
 
 // static
 AutomationManagerAura* AutomationManagerAura::GetInstance() {
   return base::Singleton<AutomationManagerAura>::get();
 }
 
@@ skipping 60 matching lines @@
       if (data.anchor_node_id != data.focus_node_id) {
         NOTREACHED();
         return;
       }
       current_tree_->SetSelection(
           data.anchor_node_id, data.anchor_offset, data.focus_offset);
       break;
     case ui::AX_ACTION_SHOW_CONTEXT_MENU:
       current_tree_->ShowContextMenu(data.target_node_id);
       break;
+#if defined(OS_CHROMEOS)
+    case ui::AX_ACTION_TOGGLE_DARKEN_SCREEN:
+      chromeos::DBusThreadManager::Get()
+          ->GetPowerManagerClient()
+          ->SetBacklightsForcedOff(
+              data.GetBoolAttribute(ui::AX_ACTION_ATTR_DARKEN_SCREEN));
+      break;
+#endif
     case ui::AX_ACTION_SET_ACCESSIBILITY_FOCUS:
       // Sent by ChromeVox but doesn't need to be handled by aura.
       break;
     case ui::AX_ACTION_SET_SEQUENTIAL_FOCUS_NAVIGATION_STARTING_POINT:
       // Sent by ChromeVox but doesn't need to be handled by aura.
       break;
     case ui::AX_ACTION_BLUR:
     case ui::AX_ACTION_DECREMENT:
     case ui::AX_ACTION_GET_IMAGE_DATA:
     case ui::AX_ACTION_HIT_TEST:
@@ skipping 77 matching lines @@
 
   processing_events_ = false;
   auto pending_events_copy = pending_events_;
   pending_events_.clear();
   for (size_t i = 0; i < pending_events_copy.size(); ++i) {
     SendEvent(context,
               pending_events_copy[i].first,
               pending_events_copy[i].second);
   }
 }