mash: Fix mash app shelf items; encapsulate ash property setup.

ui/views/examples/examples_window.h

Index: ui/views/examples/examples_window.h
diff --git a/ui/views/examples/examples_window.h b/ui/views/examples/examples_window.h
index 804252fcc9bde2ba21d2d24d5d0f02fa702ec5f7..064acddfede8bd2ede544da86db5727e0411114a 100644
--- a/ui/views/examples/examples_window.h
+++ b/ui/views/examples/examples_window.h
@@ -13,6 +13,7 @@
 #include "ui/views/examples/views_examples_export.h"
 
 namespace views {
+class Widget;
 namespace examples {
 
 enum Operation {
@@ -23,7 +24,7 @@ enum Operation {
 // Shows a window with the views examples in it. |extra_examples| contains any
 // additional examples to add. |window_context| is used to determine where the
 // window should be created (see |Widget::InitParams::context| for details).
-VIEWS_EXAMPLES_EXPORT void ShowExamplesWindow(
+VIEWS_EXAMPLES_EXPORT Widget* ShowExamplesWindow(
     Operation operation,
     gfx::NativeWindow window_context = nullptr,
     std::vector<std::unique_ptr<ExampleBase>> extra_examples =