views: Packaged app window icon should be system/generic icon, if icon is not set by default.

ui/views/widget/widget.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 UI_VIEWS_WIDGET_WIDGET_H_
 #define UI_VIEWS_WIDGET_WIDGET_H_
 
 #include <set>
 #include <stack>
 #include <vector>
@@ skipping 146 matching lines @@
     bool accept_events;
     bool can_activate;
     bool keep_on_top;
     Ownership ownership;
     bool mirror_origin_in_rtl;
     bool has_dropshadow;
     // Only used by NativeWidgetWin. Specifies that the system default caption
     // and icon should not be rendered, and that the client area should be
     // equivalent to the window area.
     bool remove_standard_frame;
+    // Only used by ShellWindow on Windows. Specifies that the default icon of
+    // packaged app should be the system default icon.
+    bool use_system_default_icon;
     // Whether the widget should be maximized or minimized.
     ui::WindowShowState show_state;
     // Should the widget be double buffered? Default is false.
     bool double_buffer;
     gfx::NativeView parent;
     Widget* parent_widget;
     // Specifies the initial bounds of the Widget. Default is empty, which means
     // the NativeWidget may specify a default size. If the parent is specified,
     // |bounds| is in the parent's coordinate system. If the parent is not
     // specified, it's in screen's global coordinate system.
@@ skipping 614 matching lines @@
 
   // Is |root_layers_| out of date?
   bool root_layers_dirty_;
 
   DISALLOW_COPY_AND_ASSIGN(Widget);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_WIDGET_H_