mash: Port mojo:ash_sysui's ContextMenuMus to mojo:ash.

ash/ash.gyp

Index: ash/ash.gyp
diff --git a/ash/ash.gyp b/ash/ash.gyp
index 426d6d14bc2739fd2f650502b644cc0102b869fb..68006f56ddf168fe3e923bd3894c04935ff31cbf 100644
--- a/ash/ash.gyp
+++ b/ash/ash.gyp
@@ -411,6 +411,7 @@
       'common/system/web_notification/ash_popup_alignment_delegate.h',
       'common/system/web_notification/web_notification_tray.cc',
       'common/system/web_notification/web_notification_tray.h',
+      'common/wallpaper/wallpaper_delegate.h',
       'common/wm/always_on_top_controller.cc',
       'common/wm/always_on_top_controller.h',
       'common/wm/background_animator.cc',
@@ -539,8 +540,8 @@
       'common/wm_window_tracker.h',
       'debug.cc',
       'debug.h',
-      'default_user_wallpaper_delegate.cc',
-      'default_user_wallpaper_delegate.h',
+      'default_wallpaper_delegate.cc',
+      'default_wallpaper_delegate.h',
       'desktop_background/desktop_background_controller.cc',
       'desktop_background/desktop_background_controller.h',
       'desktop_background/desktop_background_controller_observer.h',
@@ -548,7 +549,6 @@
       'desktop_background/desktop_background_view.h',
       'desktop_background/desktop_background_widget_controller.cc',
       'desktop_background/desktop_background_widget_controller.h',
-      'desktop_background/user_wallpaper_delegate.h',
       'display/cursor_window_controller.cc',
       'display/cursor_window_controller.h',
       'display/display_animator.h',
@@ -889,8 +889,8 @@
       'test/test_system_tray_delegate.h',
       'test/test_system_tray_item.cc',
       'test/test_system_tray_item.h',
-      'test/test_user_wallpaper_delegate.cc',
-      'test/test_user_wallpaper_delegate.h',
+      'test/test_wallpaper_delegate.cc',
+      'test/test_wallpaper_delegate.h',
       'test/tray_cast_test_api.cc',
       'test/tray_cast_test_api.h',
       'test/ui_controls_factory_ash.cc',