Launch panels as popup windows in Aura, and add separate launcher icon logic for panels.

ash/launcher/launcher_types.h

 // 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.
 
 #ifndef ASH_LAUNCHER_LAUNCHER_TYPES_H_
 #define ASH_LAUNCHER_LAUNCHER_TYPES_H_
 #pragma once
 
 #include <vector>
 
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ash/ash_export.h"
 
 namespace aura {
 class Window;
 }
 
 namespace ash {
 
 typedef int LauncherID;
 
 // Type the LauncherItem represents.
 enum ASH_EXPORT LauncherItemType {
   // Represents a tabbed browser.
   TYPE_TABBED,
 
   // Represents an app window.
   TYPE_APP,
 
+  // Represents an app panel.
+  TYPE_PANEL,
+
   // Toggles visiblity of the app list.
   TYPE_APP_LIST,
 
   // The browser shortcut button.
   TYPE_BROWSER_SHORTCUT,
 };
 
 struct ASH_EXPORT LauncherItem {
   LauncherItem();
   explicit LauncherItem(LauncherItemType type);
@@ skipping 10 matching lines @@
 
   // Assigned by the model when the item is added.
   LauncherID id;
 };
 
 typedef std::vector<LauncherItem> LauncherItems;
 
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_LAUNCHER_TYPES_H_