Implement a mostly working InfoBubble with a shim BookmarkBubble.

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,
   },
   'includes': [
     '../build/common.gypi',
@@ skipping 710 matching lines @@
         'browser/google_url_tracker.cc',
         'browser/google_url_tracker.h',
         'browser/google_util.cc',
         'browser/google_util.h',
         'browser/gtk/about_chrome_dialog.cc',
         'browser/gtk/about_chrome_dialog.h',
         'browser/gtk/back_forward_menu_model_gtk.cc',
         'browser/gtk/back_forward_menu_model_gtk.h',
         'browser/gtk/bookmark_bar_gtk.cc',
         'browser/gtk/bookmark_bar_gtk.h',
+        'browser/gtk/bookmark_bubble_gtk.cc',
+        'browser/gtk/bookmark_bubble_gtk.h',
         'browser/gtk/bookmark_editor_gtk.cc',
         'browser/gtk/bookmark_editor_gtk.h',
         'browser/gtk/browser_toolbar_gtk.cc',
         'browser/gtk/browser_toolbar_gtk.h',
         'browser/gtk/browser_window_factory_gtk.cc',
         'browser/gtk/browser_window_gtk.cc',
         'browser/gtk/browser_window_gtk.h',
         '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/go_button_gtk.cc',
         'browser/gtk/go_button_gtk.h',
         'browser/gtk/gtk_chrome_button.cc',
         'browser/gtk/gtk_chrome_button.h',
+        'browser/gtk/info_bubble_gtk.cc',
+        'browser/gtk/info_bubble_gtk.h',
+        'browser/gtk/infobar_container_gtk.cc',
+        'browser/gtk/infobar_container_gtk.h',
         'browser/gtk/infobar_gtk.cc',
         'browser/gtk/infobar_gtk.h',
-        'browser/gtk/infobar_container_gtk.cc',
-        'browser/gtk/infobar_container_gtk.h',
         'browser/gtk/find_bar_gtk.cc',
         'browser/gtk/find_bar_gtk.h',
         'browser/gtk/link_button_gtk.cc',
         'browser/gtk/link_button_gtk.cc',
         'browser/gtk/location_bar_view_gtk.cc',
         'browser/gtk/location_bar_view_gtk.h',
         'browser/gtk/menu_gtk.cc',
         'browser/gtk/menu_gtk.h',
         'browser/gtk/nine_box.cc',
         'browser/gtk/nine_box.h',
@@ skipping 2247 matching lines @@
                           '../tools/code_coverage/coverage_posix.py',
                           '--directory',
                           '<(PRODUCT_DIR)' ],
             },
           ],  # 'actions'
         },
       ]
     }],
   ],  # 'conditions'
 }