Support dragging panels to stack and snap.

chrome/chrome_browser_ui.gypi

 # Copyright 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.
 
 {
   'targets': [
     {
       'target_name': 'browser_ui',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 1153 matching lines @@
         'browser/ui/panels/detached_panel_drag_handler.h',
         'browser/ui/panels/display_settings_provider_win.cc',
         'browser/ui/panels/display_settings_provider_win.h',
         'browser/ui/panels/display_settings_provider.cc',
         'browser/ui/panels/display_settings_provider.h',
         'browser/ui/panels/docked_panel_collection.cc',
         'browser/ui/panels/docked_panel_collection.h',
         'browser/ui/panels/docked_panel_drag_handler.cc',
         'browser/ui/panels/docked_panel_drag_handler.h',
         'browser/ui/panels/native_panel.h',
+        'browser/ui/panels/native_panel_stack.cc',
+        'browser/ui/panels/native_panel_stack.h',
         'browser/ui/panels/panel.cc',
         'browser/ui/panels/panel.h',
         'browser/ui/panels/panel_bounds_animation.cc',
         'browser/ui/panels/panel_bounds_animation.h',
         'browser/ui/panels/panel_collection.cc',
         'browser/ui/panels/panel_collection.h',
         'browser/ui/panels/panel_constants.h',
         'browser/ui/panels/panel_drag_controller.cc',
         'browser/ui/panels/panel_drag_controller.h',
         'browser/ui/panels/panel_host.cc',
@@ skipping 456 matching lines @@
         'browser/ui/views/omnibox/touch_omnibox_popup_contents_view.cc',
         'browser/ui/views/omnibox/touch_omnibox_popup_contents_view.h',
         'browser/ui/views/open_pdf_in_reader_bubble_view.cc',
         'browser/ui/views/open_pdf_in_reader_bubble_view.h',
         'browser/ui/views/other_device_menu_views.cc',
         'browser/ui/views/other_device_menu_views.h',
         'browser/ui/views/page_info_bubble_view.cc',
         'browser/ui/views/page_info_bubble_view.h',
         'browser/ui/views/panels/panel_frame_view.cc',
         'browser/ui/views/panels/panel_frame_view.h',
+        'browser/ui/views/panels/panel_stack_view.cc',
+        'browser/ui/views/panels/panel_stack_view.h',
         'browser/ui/views/panels/panel_view.cc',
         'browser/ui/views/panels/panel_view.h',
         'browser/ui/views/password_generation_bubble_view.cc',
         'browser/ui/views/password_generation_bubble_view.h',
         'browser/ui/views/reload_button.cc',
         'browser/ui/views/reload_button.h',
         'browser/ui/views/sad_tab_view.cc',
         'browser/ui/views/sad_tab_view.h',
         'browser/ui/views/script_bubble_view.cc',
         'browser/ui/views/script_bubble_view.h',
@@ skipping 1145 matching lines @@
         }],
         ['enable_message_center==1', {
           'dependencies': [
             '../ui/message_center/message_center.gyp:message_center',
           ],
         }],
       ],
     },
   ],
 }