Initial support for native accessibility in ARC

components/exo/surface.h

Index: components/exo/surface.h
diff --git a/components/exo/surface.h b/components/exo/surface.h
index 0aeaa0edaa9481a287195be1f8d3fc6d73a52346..5f5c58f8ea37e4bbbbbb1cc9cfee77625d313034 100644
--- a/components/exo/surface.h
+++ b/components/exo/surface.h
@@ -42,6 +42,7 @@ class Path;
 }
 
 namespace exo {
+class AXTreeSourceSurface;
 class Buffer;
 class Pointer;
 class SurfaceDelegate;
@@ -238,6 +239,10 @@ class Surface : public ui::ContextFactoryObserver,
     return pending_damage_.contains(gfx::RectToSkIRect(damage));
   }
 
+  // Sets the accessible tree source for this surface.
+  void set_ax_tree_source(AXTreeSourceSurface* tree) { ax_tree_source_ = tree; }
+  AXTreeSourceSurface* ax_tree_source() { return ax_tree_source_; }
+
  private:
   struct State {
     State();
@@ -417,6 +422,9 @@ class Surface : public ui::ContextFactoryObserver,
   // references to surfaces.
   scoped_refptr<cc::SurfaceReferenceFactory> surface_reference_factory_;
 
+  // Not owned by this class.
+  AXTreeSourceSurface* ax_tree_source_;
+
   DISALLOW_COPY_AND_ASSIGN(Surface);
 };