Transparent apps support

chrome/browser/ui/extensions/shell_window.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_EXTENSIONS_SHELL_WINDOW_H_
 #define CHROME_BROWSER_UI_EXTENSIONS_SHELL_WINDOW_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/extensions/extension_function_dispatcher.h"
 #include "chrome/browser/extensions/extension_keybinding_registry.h"
@@ skipping 42 matching lines @@
     FRAME_CHROME,  // Chrome-style window frame.
     FRAME_NONE,  // Frameless window.
   };
 
   struct CreateParams {
     CreateParams();
     ~CreateParams();
 
     WindowType window_type;
     Frame frame;
+    bool transparent_background;  // Only supported on ash.
 
     // Specify the initial content bounds of the window (excluding any window
     // decorations). INT_MIN designates 'unspecified' for the position
     // components, and 0 for the size components. When unspecified, they should
     // be replaced with a default value.
     gfx::Rect bounds;
 
     gfx::Size minimum_size;
     gfx::Size maximum_size;
 
@@ skipping 173 matching lines @@
   GURL app_icon_url_;
 
   scoped_ptr<NativeAppWindow> native_app_window_;
 
   base::WeakPtrFactory<ShellWindow> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellWindow);
 };
 
 #endif  // CHROME_BROWSER_UI_EXTENSIONS_SHELL_WINDOW_H_