Create Tooltip object lazily so that it gets proper drop shadow

ash/shell.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/shell.h"
 
 #include <algorithm>
 #include <string>
 
 #include "ash/accelerators/focus_manager_factory.h"
@@ skipping 435 matching lines @@
   if (internal::DisplayController::IsExtendedDesktopEnabled()) {
     mouse_cursor_filter_.reset(
         new internal::MouseCursorEventFilter(display_controller_.get()));
     AddEnvEventFilter(mouse_cursor_filter_.get());
   }
 
   high_contrast_controller_.reset(new HighContrastController);
   video_detector_.reset(new VideoDetector);
   window_cycle_controller_.reset(new WindowCycleController);
 
+  tooltip_controller_.reset(new internal::TooltipController(
+      drag_drop_controller_.get()));
+  AddEnvEventFilter(tooltip_controller_.get());
+
   InitRootWindowController(root_window_controller);
 
   // Initialize Primary RootWindow specific items.
   status_area_widget_ = new internal::StatusAreaWidget();
   status_area_widget_->CreateTrayViews(delegate_.get());
   status_area_widget_->Show();
 
   focus_cycler_.reset(new internal::FocusCycler());
   focus_cycler_->AddWidget(status_area_widget_);
 
   // This controller needs to be set before SetupManagedWindowMode.
   desktop_background_controller_.reset(new DesktopBackgroundController());
   if (delegate_.get())
     user_wallpaper_delegate_.reset(delegate_->CreateUserWallpaperDelegate());
   if (!user_wallpaper_delegate_.get())
     user_wallpaper_delegate_.reset(new DummyUserWallpaperDelegate());
 
   InitLayoutManagersForPrimaryDisplay(root_window_controller);
 
   if (!command_line->HasSwitch(switches::kAuraNoShadows)) {
     resize_shadow_controller_.reset(new internal::ResizeShadowController());
     shadow_controller_.reset(new internal::ShadowController());
   }
 
-  // Tooltip controller must be created after shadow controller so that the
-  // tooltip window can be initialized with appropriate shadows.
-  tooltip_controller_.reset(new internal::TooltipController(
-      drag_drop_controller_.get()));
-  AddEnvEventFilter(tooltip_controller_.get());
-  aura::client::SetTooltipClient(root_window, tooltip_controller_.get());
-
   if (!delegate_.get() || delegate_->IsUserLoggedIn())
     CreateLauncher();
 
   // Force Layout
   root_window_controller->root_window_layout()->OnWindowResized();
 
   // It needs to be created after OnWindowResized has been called, otherwise the
   // widget will not paint when restoring after a browser crash.
   user_wallpaper_delegate_->InitializeWallpaper();
 
@@ skipping 206 matching lines @@
   DCHECK(capture_controller_.get());
 
   root_window->set_focus_manager(focus_manager_.get());
   input_method_filter_->SetInputMethodPropertyInRootWindow(root_window);
   aura::client::SetActivationClient(root_window, activation_controller_.get());
   aura::client::SetVisibilityClient(root_window, visibility_controller_.get());
   aura::client::SetDragDropClient(root_window, drag_drop_controller_.get());
   aura::client::SetCaptureClient(root_window, capture_controller_.get());
   aura::client::SetScreenPositionClient(root_window,
                                         screen_position_controller_.get());
+  aura::client::SetTooltipClient(root_window, tooltip_controller_.get());
 
   if (nested_dispatcher_controller_.get()) {
     aura::client::SetDispatcherClient(root_window,
                                       nested_dispatcher_controller_.get());
   }
   if (user_action_client_.get())
     aura::client::SetUserActionClient(root_window, user_action_client_.get());
 
   root_window->SetCursor(ui::kCursorPointer);
   controller->InitLayoutManagers();
@@ skipping 61 matching lines @@
 }
 
 void Shell::ShowCursor(bool visible) {
   RootWindowList root_windows = GetAllRootWindows();
   for (RootWindowList::iterator iter = root_windows.begin();
        iter != root_windows.end(); ++iter)
     (*iter)->ShowCursor(visible);
 }
 
 }  // namespace ash