Prepare for building with enable_app_list=0 on Desktop

chrome/common/extensions/api/schemas.gypi

 # Copyright 2014 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.
 
 {
   'sources': [
     '<@(schema_files)',
   ],
   'variables': {
     'main_schema_files': [
@@ skipping 36 matching lines @@
       'gcm.json',
       'history.json',
       'hotword_private.idl',
       'i18n.json',
       'identity.idl',
       'identity_private.idl',
       'image_writer_private.idl',
       'inline_install_private.idl',
       'instance_id.json',
       'language_settings_private.idl',
-      'launcher_page.idl',
       'manifest_types.json',
       'media_galleries.idl',
       'metrics_private.json',
       'notification_provider.idl',
       'notifications.idl',
       'omnibox.json',
       'page_capture.json',
       'passwords_private.idl',
       'permissions.json',
       'preferences_private.json',
@@ skipping 67 matching lines @@
       'gcd_private.idl',
       'mdns.idl',
     ],
 
     'webrtc_schema_files': [
       'cast_streaming_receiver_session.idl',
       'cast_streaming_rtp_stream.idl',
       'cast_streaming_session.idl',
       'cast_streaming_udp_transport.idl',
     ],
-    
+    'app_list_schema_files': [
+      # TODO(tapted): Move this into chromeos_schema_files.
+      'launcher_page.idl',
+    ],
+
     'task_manager_dependent_schema_files': [
       'processes.idl',
     ],
 
     # Input IME schema.
     'input_ime_schema_file': [
       'input_ime.json',
     ],
 
     'non_compiled_schema_files': [
@@ skipping 37 matching lines @@
       ['enable_service_discovery==1', {
         'schema_files': [
           '<@(service_discovery_schema_files)',
         ],
       }],
       ['enable_webrtc==1', {
         'schema_files': [
           '<@(webrtc_schema_files)',
         ],
       }],
+      ['enable_app_list==1', {
+        'schema_files': [
+          '<@(app_list_schema_files)',
+        ],
+      }],
     ],
     'cc_dir': 'chrome/common/extensions/api',
     'root_namespace': 'extensions::api::%(namespace)s',
     'bundle_name': 'Chrome',
     'impl_dir_': 'chrome/browser/extensions/api',
   },
 }