Extend AXTreeSourceViews to handle aura::Window and views::Widget.

ui/accessibility/ax_view_state.h

Index: ui/accessibility/ax_view_state.h
diff --git a/ui/accessibility/ax_view_state.h b/ui/accessibility/ax_view_state.h
index 5d72d47a3c3f73a823503d2caec3b2361afdffd1..2f1aab093330eadf9f6358ca2846d9810060cab3 100644
--- a/ui/accessibility/ax_view_state.h
+++ b/ui/accessibility/ax_view_state.h
@@ -30,6 +30,11 @@ struct AX_EXPORT AXViewState {
   void AddStateFlag(ui::AXState state);
   bool HasStateFlag(ui::AXState state) const;
 
+  // The view's state, a bitmask containing fields such as checked
+  // (for a checkbox) and protected (for a password text box). This "state"
+  // should not be confused with the class's name.
+  uint32 state() { return state_; }
+
   // The view's role, like button or list box.
   AXRole role;
 
@@ -68,8 +73,6 @@ struct AX_EXPORT AXViewState {
   base::Callback<void(const base::string16&)> set_value_callback;
 
  private:
-  // The view's state, a bitmask containing fields such as checked
-  // (for a checkbox) and protected (for a password text box).
   uint32 state_;
 };