On Linux, the App Launcher is now shown in the taskbar.

ui/app_list/views/app_list_view.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 "ui/app_list/views/app_list_view.h"
 
 #include "base/command_line.h"
 #include "base/strings/string_util.h"
 #include "ui/app_list/app_list_constants.h"
 #include "ui/app_list/app_list_model.h"
@@ skipping 307 matching lines @@
     views::Widget::InitParams* params,
     views::Widget* widget) const {
 #if defined(USE_AURA) && !defined(OS_CHROMEOS)
   if (delegate_ && delegate_->ForceNativeDesktop())
     params->native_widget = new views::DesktopNativeWidgetAura(widget);
 #endif
 #if defined(OS_LINUX)
   // Set up a custom WM_CLASS for the app launcher window. This allows task
   // switchers in X11 environments to distinguish it from main browser windows.
   params->wm_class_name = kAppListWMClass;
+  // Show the window in the taskbar, even though it is a bubble, which would not
+  // normally be shown.
+  params->override_show_in_taskbar = true;
 #endif
 }
 
 views::View* AppListView::GetInitiallyFocusedView() {
   return app_list_main_view_->search_box_view()->search_box();
 }
 
 gfx::ImageSkia AppListView::GetWindowIcon() {
   if (delegate_)
     return delegate_->GetWindowIcon();
@@ skipping 125 matching lines @@
 #else
   speech_view_->SetVisible(recognizing);
   app_list_main_view_->SetVisible(!recognizing);
 #endif
 
   // Needs to schedule paint of AppListView itself, to repaint the background.
   SchedulePaint();
 }
 
 }  // namespace app_list