ui + mus: Split ContextFactory into ContextFactory(Client) and ContextFactoryPrivate

ui/views/test/test_views_delegate_mac.mm

Index: ui/views/test/test_views_delegate_mac.mm
diff --git a/ui/views/test/test_views_delegate_mac.mm b/ui/views/test/test_views_delegate_mac.mm
index 652c3976303bb196106dab63fdd35983215bd4da..6c9a57426fa5bf6ae73a263a64c8c33be5260ab4 100644
--- a/ui/views/test/test_views_delegate_mac.mm
+++ b/ui/views/test/test_views_delegate_mac.mm
@@ -10,9 +10,9 @@ namespace views {
 
 TestViewsDelegate::TestViewsDelegate()
     : context_factory_(nullptr),
+      context_factory_private_(nullptr),
       use_desktop_native_widgets_(false),
-      use_transparent_windows_(false) {
-}
+      use_transparent_windows_(false) {}
 
 TestViewsDelegate::~TestViewsDelegate() {
 }
@@ -34,4 +34,8 @@ ui::ContextFactory* TestViewsDelegate::GetContextFactory() {
   return context_factory_;
 }
 
+ui::ContextFactoryPrivate* TestViewsDelegate::GetContextFactoryPrivate() {
+  return context_factory_private_;
+}
+
 }  // namespace views