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 36 matching lines @@
   struct CreateParams {
     enum Frame {
       FRAME_CHROME, // Chrome-style window frame.
       FRAME_NONE, // Frameless window.
     };
 
     CreateParams();
     ~CreateParams();
 
     Frame frame;
+    bool transparent_background;  // Only supported on ash.
+
     // Specify the initial bounds of the window. INT_MIN designates
     // 'unspecified' for any coordinate, and should be replaced with a default
     // value.
     gfx::Rect bounds;
     // Specify if bounds should be restored from a previous time.
     bool restore_position;
     bool restore_size;
 
     gfx::Size minimum_size;
     gfx::Size maximum_size;
@@ skipping 146 matching lines @@
 
   // Used for loading app_icon_.
   scoped_ptr<ImageLoadingTracker> app_icon_loader_;
 
   scoped_ptr<NativeShellWindow> native_window_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellWindow);
 };
 
 #endif  // CHROME_BROWSER_UI_EXTENSIONS_SHELL_WINDOW_H_