Moves Shell::ShowShelf() to WmShell

ash/common/wm_root_window_controller.cc

Index: ash/common/wm_root_window_controller.cc
diff --git a/ash/common/wm_root_window_controller.cc b/ash/common/wm_root_window_controller.cc
index debeb1ab021214f8995ad301b4afdbe9d5ccfb28..82af9b4316f653fa2db42b6bf3335168c05c8b7b 100644
--- a/ash/common/wm_root_window_controller.cc
+++ b/ash/common/wm_root_window_controller.cc
@@ -5,9 +5,11 @@
 #include "ash/common/wm_root_window_controller.h"
 
 #include "ash/common/session/session_state_delegate.h"
+#include "ash/common/shelf/shelf_widget.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/shell_delegate.h"
 #include "ash/common/shell_window_ids.h"
+#include "ash/common/system/status_area_widget.h"
 #include "ash/common/wallpaper/wallpaper_delegate.h"
 #include "ash/common/wallpaper/wallpaper_widget_controller.h"
 #include "ash/common/wm/always_on_top_controller.h"
@@ -190,6 +192,15 @@ WmRootWindowController::GetSystemModalLayoutManager(WmWindow* window) {
                          : nullptr;
 }
 
+void WmRootWindowController::ShowShelf() {
+  WmShelf* shelf = GetShelf();
+  if (!shelf->IsShelfInitialized())
+    return;
+  // TODO(jamescook): Move this into WmShelf.
+  shelf->shelf_widget()->SetShelfVisibility(true);
+  shelf->shelf_widget()->status_area_widget()->Show();
+}
+
 WmWindow* WmRootWindowController::GetContainer(int container_id) {
   return root_->GetChildByShellWindowId(container_id);
 }