MacViews/a11y: Allow accessibility clients to focus and unfocus focusable Views.

ui/views/accessibility/native_view_accessibility.cc

Index: ui/views/accessibility/native_view_accessibility.cc
diff --git a/ui/views/accessibility/native_view_accessibility.cc b/ui/views/accessibility/native_view_accessibility.cc
index db1c1c472d8c60cf849cae4f8d4980f1622798e0..04a0fa5afb95126235feb7432fb72ff02c50bf93 100644
--- a/ui/views/accessibility/native_view_accessibility.cc
+++ b/ui/views/accessibility/native_view_accessibility.cc
@@ -217,6 +217,17 @@ bool NativeViewAccessibility::CanSetStringValue() {
   return !ui::AXNodeData::IsFlagSet(GetData().state, ui::AX_STATE_READ_ONLY);
 }
 
+bool NativeViewAccessibility::SetFocused(bool focused) {
+  if (!ui::AXNodeData::IsFlagSet(GetData().state, ui::AX_STATE_FOCUSABLE))
+    return false;
+
+  if (focused)
+    view_->RequestFocus();
+  else if (view_->HasFocus())
+    view_->GetFocusManager()->ClearFocus();
+  return true;
+}
+
 void NativeViewAccessibility::OnWidgetDestroying(Widget* widget) {
   if (parent_widget_ == widget) {
     parent_widget_->RemoveObserver(this);