Wire up an api to darken screen for accessibility

ui/accessibility/ax_action_data.cc

 // Copyright 2016 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 "ui/accessibility/ax_action_data.h"
 
+#include <algorithm>
 #include <set>
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 
 using base::IntToString;
 
 namespace ui {
 
 AXActionData::AXActionData()
     : action(AX_ACTION_NONE),
       target_node_id(-1),
       flags(0),
       anchor_node_id(-1),
       anchor_offset(-1),
       focus_node_id(-1),
       focus_offset(-1) {
 }
 
 AXActionData::AXActionData(const AXActionData& other) = default;
 
 AXActionData::~AXActionData() {
 }
 
+void AXActionData::AddBoolAttribute(AXActionBoolAttribute attribute,
+                                    bool value) {
+  bool_attributes.push_back(std::make_pair(attribute, value));
+}
+
+bool AXActionData::GetBoolAttribute(AXActionBoolAttribute attr) const {
+  auto iter =
+      std::find_if(bool_attributes.begin(), bool_attributes.end(),
+                   [attr](const std::pair<AXActionBoolAttribute, bool>& item) {
+                     return item.first == attr;
+                   });
+  return iter != bool_attributes.end() && iter->second;
+}
+
 // Note that this includes an initial space character if nonempty, but
 // that works fine because this is normally printed by AXAction::ToString.
 std::string AXActionData::ToString() const {
   std::string result = ui::ToString(action);
 
   if (target_node_id != -1)
     result += " target_node_id=" + IntToString(target_node_id);
 
   if (flags & (1 << ui::AX_ACTION_FLAGS_REQUEST_IMAGES))
     result += " flag_request_images";
 
   if (flags & (1 << ui::AX_ACTION_FLAGS_REQUEST_INLINE_TEXT_BOXES))
     result += " flag_request_inline_text_boxes";
 
   if (anchor_node_id != -1) {
     result += " anchor_node_id=" + IntToString(anchor_node_id);
     result += " anchor_offset=" + IntToString(anchor_offset);
   }
   if (focus_node_id != -1) {
     result += " focus_node_id=" + IntToString(focus_node_id);
     result += " focus_offset=" + IntToString(focus_offset);
   }
 
   return result;
 }
 
 }  // namespace ui