Initial support for native accessibility in ARC

components/exo/ax_tree_source_surface.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.

[yawano, 2017/01/23 10:41:53]

2017 instead of 2015?

[David Tseng, 2017/01/23 20:56:00]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/exo/ax_tree_source_surface.h"
+
+namespace exo {
+
+AXTreeSourceSurface::AXTreeSourceSurface() {}
+
+AXTreeSourceSurface::~AXTreeSourceSurface() {}
+
+void AXTreeSourceSurface::NotifyAccessibilityEvent(uint32_t node_id,
+                                                   ui::AXEvent event) {
+  for (AXTreeSourceSurface::Observer& observer : observers_)
+    observer.OnAccessibilityEvent(node_id, event);
+}
+
+void AXTreeSourceSurface::AddObserver(Observer* observer) {
+  observers_.AddObserver(observer);
+  Reset();
+}
+
+void AXTreeSourceSurface::RemoveObserver(Observer* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+}  // namespace exo