mash: Create and show a shelf in mash.

ash/app_list/app_list_presenter_delegate.h

Index: ash/app_list/app_list_presenter_delegate.h
diff --git a/ash/app_list/app_list_presenter_delegate.h b/ash/app_list/app_list_presenter_delegate.h
index 01d50889450ee24bdcf40c5e3204c60192e2b405..f837a14e34daed5173c39576d44fcf427e44acb7 100644
--- a/ash/app_list/app_list_presenter_delegate.h
+++ b/ash/app_list/app_list_presenter_delegate.h
@@ -8,7 +8,7 @@
 #include <stdint.h>
 
 #include "ash/ash_export.h"
-#include "ash/common/shelf/shelf_icon_observer.h"
+#include "ash/common/shelf/wm_shelf_observer.h"
 #include "ash/common/shell_observer.h"
 #include "base/macros.h"
 #include "ui/app_list/presenter/app_list_presenter_delegate.h"
@@ -42,7 +42,7 @@ class ASH_EXPORT AppListPresenterDelegate
       public ui::EventHandler,
       public keyboard::KeyboardControllerObserver,
       public ShellObserver,
-      public ShelfIconObserver {
+      public WmShelfObserver {
  public:
   AppListPresenterDelegate(
       app_list::AppListPresenter* presenter,
@@ -76,7 +76,7 @@ class ASH_EXPORT AppListPresenterDelegate
   void OnMaximizeModeStarted() override;
   void OnMaximizeModeEnded() override;
 
-  // ShelfIconObserver overrides:
+  // WmShelfObserver overrides:
   void OnShelfIconPositionsChanged() override;
 
   // Whether the app list is visible (or in the process of being shown).