chromeos: Refactor shelf to create ShelfView earlier in startup

ash/wm/workspace/workspace_layout_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/wm/workspace/workspace_layout_manager.h"
 
 #include <algorithm>
 
 #include "ash/keyboard/keyboard_observer_register.h"
 #include "ash/public/cpp/shell_window_ids.h"
@@ skipping 356 matching lines @@
   // If a user plugs an external display into a laptop running Aura the
   // display size will change.  Maximized windows need to resize to match.
   // We also do this when developers running Aura on a desktop manually resize
   // the host window.
   // We also need to do this when the work area insets changes.
   for (aura::Window* window : windows_)
     wm::GetWindowState(window)->OnWMEvent(event);
 }
 
 void WorkspaceLayoutManager::UpdateShelfVisibility() {
-  if (root_window_controller_->HasShelf())
-    root_window_controller_->GetShelf()->UpdateVisibilityState();
+  root_window_controller_->wm_shelf()->UpdateVisibilityState();
 }
 
 void WorkspaceLayoutManager::UpdateFullscreenState() {
   // TODO(flackr): The fullscreen state is currently tracked per workspace
   // but the shell notification implies a per root window state. Currently
   // only windows in the default workspace container will go fullscreen but
   // this should really be tracked by the RootWindowController since
   // technically any container could get a fullscreen window.
   if (window_->id() != kShellWindowId_DefaultContainer)
     return;
@@ skipping 14 matching lines @@
   for (aura::Window* window : windows) {
     wm::WindowState* window_state = wm::GetWindowState(window);
     if (window_on_top)
       window_state->DisableAlwaysOnTop(WmWindow::Get(window_on_top));
     else
       window_state->RestoreAlwaysOnTop();
   }
 }
 
 }  // namespace ash