Try 2: Completely redo how themes are stored on disk and processed at install time.

chrome/chrome_browser.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': '<(library)',
       'msvs_guid': '5BF908A7-68FB-4A4B-99E3-8C749F1FE4EA',
@@ skipping 170 matching lines @@
         'browser/browser_main_win.cc',
         'browser/browser_main_win.h',
         'browser/browser_prefs.cc',
         'browser/browser_prefs.h',
         'browser/browser_process.cc',
         'browser/browser_process.h',
         'browser/browser_process_impl.cc',
         'browser/browser_process_impl.h',
         'browser/browser_shutdown.cc',
         'browser/browser_shutdown.h',
+        'browser/browser_theme_pack.cc',
+        'browser/browser_theme_pack.h',
         'browser/browser_theme_provider_gtk.cc',
         'browser/browser_theme_provider_mac.mm',
         'browser/browser_theme_provider.cc',
         'browser/browser_theme_provider.h',
         'browser/browser_trial.cc',
         'browser/browser_trial.h',
         'browser/browser_url_handler.cc',
         'browser/browser_url_handler.h',
         'browser/browser_window.h',
         'browser/browsing_data_remover.cc',
@@ skipping 2198 matching lines @@
       ],
     },
   ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: