Reland Extend AXTreeSourceViews to support views::Widget and aura::Window.

ui/views/accessibility/ax_aura_obj_cache.h

Index: ui/views/accessibility/ax_aura_obj_cache.h
diff --git a/ui/views/accessibility/ax_aura_obj_cache.h b/ui/views/accessibility/ax_aura_obj_cache.h
new file mode 100644
index 0000000000000000000000000000000000000000..6e5d9e829a9b957abe5034b17905bab227bd136f
--- /dev/null
+++ b/ui/views/accessibility/ax_aura_obj_cache.h
@@ -0,0 +1,83 @@
+// 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.
+
+#ifndef UI_VIEWS_ACCESSIBILITY_AX_AURA_OBJ_CACHE_H_
+#define UI_VIEWS_ACCESSIBILITY_AX_AURA_OBJ_CACHE_H_
+
+#include <map>
+
+#include "base/basictypes.h"
+#include "ui/views/views_export.h"
+
+template <typename T> struct DefaultSingletonTraits;
+
+namespace aura {
+class Window;
+}  // namespace aura
+
+namespace views {
+class AXAuraObjWrapper;
+class View;
+class Widget;
+
+// A cache responsible for assigning id's to a set of interesting Aura views.
+class VIEWS_EXPORT AXAuraObjCache {
+ public:
+  // Get the single instance of this class.
+  static AXAuraObjCache* GetInstance();
+
+  // Get or create an entry in the cache based on an Aura view.
+  AXAuraObjWrapper* GetOrCreate(View* view);
+  AXAuraObjWrapper* GetOrCreate(Widget* widget);
+  AXAuraObjWrapper* GetOrCreate(aura::Window* window);
+
+  // Gets an id given an Aura view.
+  int32 GetID(View* view);
+  int32 GetID(Widget* widget);
+  int32 GetID(aura::Window* window);
+
+  // Gets the next unique id for this cache. Useful for non-Aura view backed
+  // views.
+  int32 GetNextID() { return current_id_++; }
+
+  // Removes an entry from this cache based on an Aura view.
+  void Remove(View* view);
+  void Remove(Widget* widget);
+  void Remove(aura::Window* window);
+
+  // Lookup a cached entry based on an id.
+  AXAuraObjWrapper* Get(int32 id);
+
+  // Remove a cached entry based on an id.
+  void Remove(int32 id);
+
+ private:
+  friend struct DefaultSingletonTraits<AXAuraObjCache>;
+
+  AXAuraObjCache();
+  virtual ~AXAuraObjCache();
+
+  template <typename AuraViewWrapper, typename AuraView>
+      AXAuraObjWrapper* CreateInternal(
+          AuraView* aura_view, std::map<AuraView*, int32>& aura_view_to_id_map);
+
+  template<typename AuraView> int32 GetIDInternal(
+      AuraView* aura_view, std::map<AuraView*, int32>& aura_view_to_id_map);
+
+  template<typename AuraView> void RemoveInternal(
+      AuraView* aura_view, std::map<AuraView*, int32>& aura_view_to_id_map);
+
+  std::map<views::View*, int32> view_to_id_map_;
+  std::map<views::Widget*, int32> widget_to_id_map_;
+  std::map<aura::Window*, int32> window_to_id_map_;
+
+  std::map<int32, AXAuraObjWrapper*> cache_;
+  int32 current_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(AXAuraObjCache);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_ACCESSIBILITY_AX_AURA_OBJ_CACHE_H_