Initial support for native accessibility in ARC

components/exo/shell_surface.cc

Index: components/exo/shell_surface.cc
diff --git a/components/exo/shell_surface.cc b/components/exo/shell_surface.cc
index 40fd30b14503b90eabadc448c3f7b96f2369cece..91b568280f3ee719b623cec67f3b529cd508fe95 100644
--- a/components/exo/shell_surface.cc
+++ b/components/exo/shell_surface.cc
@@ -23,6 +23,8 @@
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "components/exo/surface.h"
+#include "ui/accessibility/ax_enums.h"
+#include "ui/accessibility/ax_node_data.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/cursor_client.h"
 #include "ui/aura/window.h"
@@ -787,6 +789,12 @@ void ShellSurface::OnSurfaceDestroying(Surface* surface) {
     surface_destroyed_callback_.Run();
 }
 
+void ShellSurface::OnSurfaceAXTreeChanged(int32_t id) {
+  ax_tree_id_ = id;
+
+  NotifyAccessibilityEvent(ui::AX_EVENT_CHILDREN_CHANGED, false);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // views::WidgetDelegate overrides:
 
@@ -871,6 +879,12 @@ gfx::Size ShellSurface::GetMinimumSize() const {
   return gfx::Size(1, 1);
 }
 
+void ShellSurface::GetAccessibleNodeData(ui::AXNodeData* node_data) {
+  if (ax_tree_id_)
+    node_data->AddIntAttribute(ui::AX_ATTR_CHILD_TREE_ID, ax_tree_id_);
+  node_data->SetName("ExoShell");
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // ash::wm::WindowStateObserver overrides: