Add always-on-top property to app windows

chrome/browser/extensions/api/app_current_window_internal/app_current_window_internal_api.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_EXTENSIONS_API_APP_CURRENT_WINDOW_INTERNAL_APP_CURRENT_WINDOW_INTERNAL_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_APP_CURRENT_WINDOW_INTERNAL_APP_CURRENT_WINDOW_INTERNAL_API_H_
 
 #include "chrome/browser/extensions/extension_function.h"
 
 namespace apps {
@@ skipping 137 matching lines @@
     : public AppCurrentWindowInternalExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("app.currentWindowInternal.setInputRegion",
                              APP_CURRENTWINDOWINTERNAL_SETINPUTREGION)
 
  protected:
   virtual ~AppCurrentWindowInternalSetInputRegionFunction() {}
   virtual bool RunWithWindow(apps::ShellWindow* window) OVERRIDE;
 };
 
+class AppCurrentWindowInternalSetAlwaysOnTopFunction
+    : public AppCurrentWindowInternalExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION("app.currentWindowInternal.setAlwaysOnTop",
+                             APP_CURRENTWINDOWINTERNAL_SETALWAYSONTOP)
+
+ protected:
+  virtual ~AppCurrentWindowInternalSetAlwaysOnTopFunction() {}
+  virtual bool RunWithWindow(apps::ShellWindow* window) OVERRIDE;
+};
+
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_APP_CURRENT_WINDOW_INTERNAL_APP_CURRENT_WINDOW_INTERNAL_API_H_