Wire up an api to darken screen for accessibility

chrome/browser/chromeos/accessibility/accessibility_manager.cc

 // Copyright (c) 2013 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/chromeos/accessibility/accessibility_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 40 matching lines @@
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/ash/ash_util.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/extensions/api/accessibility_private.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/grit/browser_resources.h"
 #include "chromeos/audio/audio_a11y_controller.h"
 #include "chromeos/audio/chromeos_sounds.h"
+#include "chromeos/dbus/dbus_thread_manager.h"
+#include "chromeos/dbus/power_manager_client.h"
 #include "components/prefs/pref_member.h"
 #include "components/prefs/pref_service.h"
 #include "components/session_manager/core/session_manager.h"
 #include "content/public/browser/browser_accessibility_state.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/web_ui.h"
 #include "content/public/common/content_switches.h"
@@ skipping 1302 matching lines @@
   PlayEarcon(SOUND_SPOKEN_FEEDBACK_DISABLED, PlaySoundOption::ALWAYS);
   // Clear the accessibility focus ring.
   AccessibilityFocusRingController::GetInstance()->SetFocusRing(
       std::vector<gfx::Rect>(),
       AccessibilityFocusRingController::PERSIST_FOCUS_RING);
 
   if (chromevox_panel_) {
     chromevox_panel_->Close();
     chromevox_panel_ = nullptr;
   }
+
+  // In case the user darkened the screen, undarken it now.
+  chromeos::DBusThreadManager::Get()
+      ->GetPowerManagerClient()
+      ->SetBacklightsForcedOff(false);
 }
 
 void AccessibilityManager::PostSwitchChromeVoxProfile() {
   ReloadChromeVoxPanel();
 }
 
 void AccessibilityManager::ReloadChromeVoxPanel() {
   if (chromevox_panel_) {
     chromevox_panel_->Close();
     chromevox_panel_ = nullptr;
@@ skipping 29 matching lines @@
     content::BrowserContext* context) {
   keyboard_listener_extension_id_ = id;
 
   extensions::ExtensionRegistry* registry =
       extensions::ExtensionRegistry::Get(context);
   if (!extension_registry_observer_.IsObserving(registry) && !id.empty())
     extension_registry_observer_.Add(registry);
 }
 
 }  // namespace chromeos