Initial support for native accessibility in ARC

components/exo/shell_surface.h

Index: components/exo/shell_surface.h
diff --git a/components/exo/shell_surface.h b/components/exo/shell_surface.h
index d644559c4cd17dd0fb63ae9d44f878761dc6c2e4..2b0d4ce7d2983bb50da92b06d4b78b16d28bdb41 100644
--- a/components/exo/shell_surface.h
+++ b/components/exo/shell_surface.h
@@ -192,6 +192,7 @@ class ShellSurface : public SurfaceDelegate,
 
   // Overridden from SurfaceObserver:
   void OnSurfaceDestroying(Surface* surface) override;
+  void OnSurfaceAXTreeChanged(int32_t id) override;
 
   // Overridden from views::WidgetDelegate:
   bool CanResize() const override;
@@ -210,6 +211,7 @@ class ShellSurface : public SurfaceDelegate,
   // Overridden from views::View:
   gfx::Size GetPreferredSize() const override;
   gfx::Size GetMinimumSize() const override;
+  void GetAccessibleNodeData(ui::AXNodeData* node_data) override;
 
   // Overridden from ash::wm::WindowStateObserver:
   void OnPreWindowStateTypeChange(ash::wm::WindowState* window_state,
@@ -320,6 +322,7 @@ class ShellSurface : public SurfaceDelegate,
   std::unique_ptr<ScopedAnimationsDisabled> scoped_animations_disabled_;
   int top_inset_height_ = 0;
   int pending_top_inset_height_ = 0;
+  uint32_t ax_tree_id_ = 0;
 
   DISALLOW_COPY_AND_ASSIGN(ShellSurface);
 };