Aura: Support hovering restore & close buttons for full screen apps

chrome/browser/ui/browser.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 CHROME_BROWSER_UI_BROWSER_H_
 #define CHROME_BROWSER_UI_BROWSER_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 84 matching lines @@
                 public InstantDelegate {
  public:
   // SessionService::WindowType mirrors these values.  If you add to this
   // enum, look at SessionService::WindowType to see if it needs to be
   // updated.
   enum Type {
     // If you add a new type, consider updating the test
     // BrowserTest.StartMaximized.
     TYPE_TABBED = 1,
     TYPE_POPUP = 2,
-    TYPE_PANEL = 3
+    TYPE_PANEL = 3,
+    TYPE_APP = 4
   };
 
   // Possible elements of the Browser window.
   enum WindowFeature {
     FEATURE_NONE = 0,
     FEATURE_TITLEBAR = 1,
     FEATURE_TABSTRIP = 2,
     FEATURE_TOOLBAR = 4,
     FEATURE_LOCATIONBAR = 8,
     FEATURE_BOOKMARKBAR = 16,
@@ skipping 1329 matching lines @@
 
   scoped_refptr<FullscreenController> fullscreen_controller_;
 
   // True if the browser window has been shown at least once.
   bool window_has_shown_;
 
   DISALLOW_COPY_AND_ASSIGN(Browser);
 };
 
 #endif  // CHROME_BROWSER_UI_BROWSER_H_