Added basic accessibility to TreeView.

ui/views/controls/tree/tree_view.cc

Index: ui/views/controls/tree/tree_view.cc
diff --git a/ui/views/controls/tree/tree_view.cc b/ui/views/controls/tree/tree_view.cc
index 78d4693e4a7fafecd0230d8bc0b5fe479580b1ee..4104b1b3e72e1f4fd22995b2265f253025e772e7 100644
--- a/ui/views/controls/tree/tree_view.cc
+++ b/ui/views/controls/tree/tree_view.cc
@@ -42,6 +42,9 @@ static const int kTextHorizontalPadding = 2;
 // How much children are indented from their parent.
 static const int kIndent = 20;
 
+// static
+const char TreeView::kViewClassName[] = "TreeView";
+
 namespace {
 
 // Returns the color id for the background of selected text. |has_focus|
@@ -238,6 +241,12 @@ void TreeView::SetSelectedNode(TreeModelNode* model_node) {
   // remove explicitly resetting selected_node_ before invoking this.
   if (controller_ && (changed || was_empty_selection))
     controller_->OnTreeViewSelectionChanged(this);
+
+  if (changed) {
+    // TODO(dmazzoni): Decide if EVENT_SELECTION_CHANGED is a better choice for
+    // sub-item selection event.
+    NotifyAccessibilityEvent(ui::AccessibilityTypes::EVENT_FOCUS, true);
+  }
 }
 
 TreeModelNode* TreeView::GetSelectedNode() {
@@ -397,6 +406,16 @@ void TreeView::ShowContextMenu(const gfx::Point& p,
 void TreeView::GetAccessibleState(ui::AccessibleViewState* state) {
   state->role = ui::AccessibilityTypes::ROLE_OUTLINE;
   state->state = ui::AccessibilityTypes::STATE_READONLY;
+  if (!selected_node_)
+    return;
+
+  // Get selected item info.
+  state->role = ui::AccessibilityTypes::ROLE_OUTLINEITEM;
+  state->name = selected_node_->model_node()->GetTitle();
+}
+
+const char* TreeView::GetClassName() const {
+  return kViewClassName;
 }
 
 void TreeView::TreeNodesAdded(TreeModel* model,