Wire up an api to darken screen for accessibility

chrome/browser/extensions/api/automation_internal/automation_internal_api.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/extensions/api/automation_internal/automation_internal_api.h"
 
 #include <stdint.h>
 
 #include <memory>
 #include <vector>
@@ skipping 360 matching lines @@
     case api::automation_internal::ACTION_TYPE_SETACCESSIBILITYFOCUS: {
       action->action = ui::AX_ACTION_SET_ACCESSIBILITY_FOCUS;
       break;
     }
     case api::automation_internal::
         ACTION_TYPE_SETSEQUENTIALFOCUSNAVIGATIONSTARTINGPOINT: {
       action->action =
           ui::AX_ACTION_SET_SEQUENTIAL_FOCUS_NAVIGATION_STARTING_POINT;
       break;
     }
+    case api::automation_internal::ACTION_TYPE_TOGGLEDARKENSCREEN: {
+      action->action = ui::AX_ACTION_TOGGLE_DARKEN_SCREEN;
+      api::automation_internal::ToggleDarkenScreenParams darken_params;
+      EXTENSION_FUNCTION_VALIDATE(
+          api::automation_internal::ToggleDarkenScreenParams::Populate(
+              params->opt_args.additional_properties, &darken_params));
+      action->AddBoolAttribute(ui::AX_ACTION_ATTR_DARKEN_SCREEN,
+                               darken_params.darken_screen);
+      break;
+    }
     default:
       NOTREACHED();
   }
   return RespondNow(NoArguments());
 }
 
 ExtensionFunction::ResponseAction
 AutomationInternalPerformActionFunction::Run() {
   const AutomationInfo* automation_info = AutomationInfo::Get(extension());
   EXTENSION_FUNCTION_VALIDATE(automation_info && automation_info->interact);
@@ skipping 118 matching lines @@
     int result_acc_obj_id) {
   if (!error.empty()) {
     Respond(Error(error));
     return;
   }
 
   Respond(OneArgument(base::MakeUnique<base::Value>(result_acc_obj_id)));
 }
 
 }  // namespace extensions