Begin work on extension shelf for Linux.

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
     # the link of the actual chrome (or chromium) executable on
@@ skipping 1029 matching lines @@
         'browser/gtk/custom_button.cc',
         'browser/gtk/custom_button.h',
         'browser/gtk/dialogs_gtk.cc',
         'browser/gtk/download_item_gtk.cc',
         'browser/gtk/download_item_gtk.h',
         'browser/gtk/download_shelf_gtk.cc',
         'browser/gtk/download_shelf_gtk.h',
         'browser/gtk/download_started_animation_gtk.cc',
         'browser/gtk/edit_search_engine_dialog.cc',
         'browser/gtk/edit_search_engine_dialog.h',
+        'browser/gtk/extension_shelf_gtk.cc',
+        'browser/gtk/extension_shelf_gtk.h',
         'browser/gtk/first_run_bubble.cc',
         'browser/gtk/first_run_bubble.h',
         'browser/gtk/first_run_dialog.cc',
         'browser/gtk/first_run_dialog.h',
         'browser/gtk/go_button_gtk.cc',
         'browser/gtk/go_button_gtk.h',
         'browser/gtk/gtk_chrome_button.cc',
         'browser/gtk/gtk_chrome_button.h',
         'browser/gtk/gtk_chrome_link_button.cc',
         'browser/gtk/gtk_chrome_link_button.h',
@@ skipping 3967 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'
 }