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

ui/accessibility/platform/test_ax_node_wrapper.cc

Index: ui/accessibility/platform/test_ax_node_wrapper.cc
diff --git a/ui/accessibility/platform/test_ax_node_wrapper.cc b/ui/accessibility/platform/test_ax_node_wrapper.cc
index 1c6aefa254ceb71eb6a0511aacca366e8b36761b..ad5c5fb39f8422bc3f7f9a15e9c56cb95cff530d 100644
--- a/ui/accessibility/platform/test_ax_node_wrapper.cc
+++ b/ui/accessibility/platform/test_ax_node_wrapper.cc
@@ -128,6 +128,10 @@ bool TestAXNodeWrapper::CanSetStringValue() {
   return false;
 }
 
+bool TestAXNodeWrapper::SetFocused(const bool focused) {
+  return false;
+}
+
 TestAXNodeWrapper::TestAXNodeWrapper(AXTree* tree, AXNode* node)
     : tree_(tree),
       node_(node),