Add a bare-bones extension shelf that displays extension items on OS X.

chrome/chrome.gyp

 # Copyright (c) 2009 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.
 
 {
   'variables': {
     'chromium_code': 1,
 
     # Define the common dependencies that contain all the actual
     # Chromium functionality.  This list gets pulled in below by
@@ skipping 942 matching lines @@
         'browser/cocoa/download_shelf_view.mm',
         'browser/cocoa/download_started_animation_mac.mm',
         'browser/cocoa/download_util_mac.h',
         'browser/cocoa/download_util_mac.mm',
         'browser/cocoa/edit_search_engine_cocoa_controller.h',
         'browser/cocoa/edit_search_engine_cocoa_controller.mm',
         'browser/cocoa/encoding_menu_controller_delegate_mac.h',
         'browser/cocoa/encoding_menu_controller_delegate_mac.mm',
         'browser/cocoa/event_utils.h',
         'browser/cocoa/event_utils.mm',
+        'browser/cocoa/extension_shelf_controller.h',
+        'browser/cocoa/extension_shelf_controller.mm',
+        'browser/cocoa/extension_view_mac.h',
+        'browser/cocoa/extension_view_mac.mm',
         'browser/cocoa/find_bar_bridge.h',
         'browser/cocoa/find_bar_bridge.mm',
         'browser/cocoa/find_bar_cocoa_controller.h',
         'browser/cocoa/find_bar_cocoa_controller.mm',
         'browser/cocoa/find_bar_view.h',
         'browser/cocoa/find_bar_view.mm',
         'browser/cocoa/first_run_dialog.h',
         'browser/cocoa/first_run_dialog.mm',
         'browser/cocoa/focus_tracker.h',
         'browser/cocoa/focus_tracker.mm',
@@ skipping 2062 matching lines @@
         'app/nibs/About.xib',
         'app/nibs/BookmarkBar.xib',
         'app/nibs/BookmarkBubble.xib',
         'app/nibs/BookmarkEditor.xib',
         'app/nibs/BookmarkNameFolder.xib',
         'app/nibs/BrowserWindow.xib',
         'app/nibs/ClearBrowsingData.xib',
         'app/nibs/DownloadItem.xib',
         'app/nibs/DownloadShelf.xib',
         'app/nibs/EditSearchEngine.xib',
+        'app/nibs/ExtensionShelf.xib',
         'app/nibs/FindBar.xib',
         'app/nibs/FirstRunDialog.xib',
         'app/nibs/HungRendererDialog.xib',
         'app/nibs/HttpAuthLoginSheet.xib',
         'app/nibs/InfoBar.xib',
         'app/nibs/InfoBarContainer.xib',
         'app/nibs/ImportProgressDialog.xib',
         'app/nibs/KeywordEditor.xib',
         'app/nibs/MainMenu.xib',
         'app/nibs/PageInfo.xib',
@@ skipping 990 matching lines @@
         'browser/cocoa/bubble_view_unittest.mm',
         'browser/cocoa/clear_browsing_data_controller_unittest.mm',
         'browser/cocoa/clickhold_button_cell_unittest.mm',
         'browser/cocoa/command_observer_bridge_unittest.mm',
         'browser/cocoa/custom_home_pages_model_unittest.mm',
         'browser/cocoa/delayedmenu_button_unittest.mm',
         'browser/cocoa/download_shelf_mac_unittest.mm',
         'browser/cocoa/download_shelf_view_unittest.mm',
         'browser/cocoa/download_util_mac_unittest.mm',
         'browser/cocoa/edit_search_engine_cocoa_controller_unittest.mm',
+        'browser/cocoa/extension_shelf_controller_unittest.mm',
         'browser/cocoa/event_utils_unittest.mm',
         'browser/cocoa/find_bar_bridge_unittest.mm',
         'browser/cocoa/find_bar_cocoa_controller_unittest.mm',
         'browser/cocoa/find_bar_view_unittest.mm',
         'browser/cocoa/focus_tracker_unittest.mm',
         'browser/cocoa/fullscreen_window_unittest.mm',
         'browser/cocoa/hung_renderer_controller_unittest.mm',
         'browser/cocoa/infobar_container_controller_unittest.mm',
         'browser/cocoa/infobar_controller_unittest.mm',
         'browser/cocoa/infobar_gradient_view_unittest.mm',
@@ skipping 2073 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],
   ],  # 'conditions'
 }