Initial support for native accessibility in ARC

content/browser/accessibility/ax_tree_id_registry.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 "content/browser/accessibility/ax_tree_id_registry.h"
-
-#include "base/memory/singleton.h"
-
-namespace content {
-
-// static
-const AXTreeIDRegistry::AXTreeID AXTreeIDRegistry::kNoAXTreeID = -1;
-
-// static
-AXTreeIDRegistry* AXTreeIDRegistry::GetInstance() {
-  return base::Singleton<AXTreeIDRegistry>::get();
-}
-
-AXTreeIDRegistry::AXTreeID AXTreeIDRegistry::GetOrCreateAXTreeID(
-    int process_id, int routing_id) {
-  FrameID frame_id(process_id, routing_id);
-  std::map<FrameID, AXTreeID>::iterator it;
-  it = frame_to_ax_tree_id_map_.find(frame_id);
-  if (it != frame_to_ax_tree_id_map_.end())
-    return it->second;
-
-  AXTreeID new_id = ++ax_tree_id_counter_;
-  frame_to_ax_tree_id_map_[frame_id] = new_id;
-  ax_tree_to_frame_id_map_[new_id] = frame_id;
-
-  return new_id;
-}
-
-AXTreeIDRegistry::FrameID AXTreeIDRegistry::GetFrameID(
-    AXTreeIDRegistry::AXTreeID ax_tree_id) {
-  std::map<AXTreeID, FrameID>::iterator it;
-  it = ax_tree_to_frame_id_map_.find(ax_tree_id);
-  if (it != ax_tree_to_frame_id_map_.end())
-    return it->second;
-
-  return FrameID(-1, -1);
-}
-
-void AXTreeIDRegistry::RemoveAXTreeID(AXTreeIDRegistry::AXTreeID ax_tree_id) {
-  std::map<AXTreeID, FrameID>::iterator it;
-  it = ax_tree_to_frame_id_map_.find(ax_tree_id);
-  if (it != ax_tree_to_frame_id_map_.end()) {
-    frame_to_ax_tree_id_map_.erase(it->second);
-    ax_tree_to_frame_id_map_.erase(it);
-  }
-}
-
-AXTreeIDRegistry::AXTreeIDRegistry() : ax_tree_id_counter_(-1) {
-  // Always populate default desktop tree value (0 -> 0, 0).
-  GetOrCreateAXTreeID(0, 0);
-}
-
-AXTreeIDRegistry::~AXTreeIDRegistry() {
-}
-
-}  // namespace content