Make ui_chromeos_resources IDRs accessible via chrome://theme/<IDR>.

chrome/chrome_browser.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.
 
 {
   'variables': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 3146 matching lines @@
             '../device/media_transfer_protocol/media_transfer_protocol.gyp:mtp_storage_info_proto',
             '../device/media_transfer_protocol/media_transfer_protocol.gyp:device_media_transfer_protocol',
           ],
         }],
         ['OS=="linux" and chromeos==0', {
           'dependencies': [
             '../build/linux/system.gyp:libspeechd',
           ],
         }],
         ['chromeos==1', {
-          'sources': [ '<@(chrome_browser_chromeos_sources)' ],
+          'sources': [
+            '<@(chrome_browser_chromeos_sources)',
+
+            # This file is generated by GRIT.
+            '<(SHARED_INTERMEDIATE_DIR)/ui/chromeos/resources/grit/ui_chromeos_resources_map.cc',
+          ],
           'dependencies': [
             'browser_chromeos',
+            '../ui/chromeos/ui_chromeos.gyp:ui_chromeos_resources',
           ],
         }, {  # Non-ChromeOS.
           'sources': [ '<@(chrome_browser_non_chromeos_sources)' ],
         }],
         ['use_cups==1', {
           'dependencies': [
             '../printing/printing.gyp:cups',
           ],
         }],
         ['use_gnome_keyring==1', {
@@ skipping 434 matching lines @@
             'package_name': 'org/chromium/chrome/browser',
             'template_deps': ['browser/android/tab_load_status.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
       ],
      },
     ],
   ],
 }