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..5980f85f3b549759c5866b2aaf97698449a41722 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|
@@ -229,6 +232,8 @@ void TreeView::SetSelectedNode(TreeModelNode* model_node) {
     if (selected_node_ && selected_node_ != &root_)
       Expand(model_->GetParent(selected_node_->model_node()));
     SchedulePaintForNode(selected_node_);
+
+    NotifyAccessibilityEvent(ui::AccessibilityTypes::EVENT_FOCUS, true);

[dmazzoni, 2013/11/22 23:45:30]

I'm tempted to use EVENT_SELECTION_CHANGED here (seems more accurate) but go
ahead and plumb it through to a focus event inside the event router. OK to leave
alone if that doesn't work or complicates things a lot for some reason.

[zel, 2013/11/23 00:17:16]

I will add TODO here to address this later.

I picked EVENT_FOCUS since that how it seemed other controls, like menu, were
handling item selection.

   }
 
   if (selected_node_)
@@ -397,6 +402,16 @@ 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_ || !selected_node_->model_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,