Add support for UserIdleTime to Linux.

chrome/chrome.gyp

 # Copyright (c) 2010 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,
 
     'variables': {
       'version_py_path': 'tools/build/version.py',
@@ skipping 842 matching lines @@
         'browser/sync/engine/build_commit_command.cc',
         'browser/sync/engine/build_commit_command.h',
         'browser/sync/engine/change_reorder_buffer.cc',
         'browser/sync/engine/change_reorder_buffer.h',
         'browser/sync/engine/conflict_resolver.cc',
         'browser/sync/engine/conflict_resolver.h',
         'browser/sync/engine/download_updates_command.cc',
         'browser/sync/engine/download_updates_command.h',
         'browser/sync/engine/get_commit_ids_command.cc',
         'browser/sync/engine/get_commit_ids_command.h',
+        'browser/sync/engine/idle_query_linux.cc',
+        'browser/sync/engine/idle_query_linux.h',
         'browser/sync/engine/model_changing_syncer_command.cc',
         'browser/sync/engine/model_changing_syncer_command.h',
         'browser/sync/engine/model_safe_worker.h',
         'browser/sync/engine/net/gaia_authenticator.cc',
         'browser/sync/engine/net/gaia_authenticator.h',
         'browser/sync/engine/net/http_return.h',
         'browser/sync/engine/net/server_connection_manager.cc',
         'browser/sync/engine/net/server_connection_manager.h',
         'browser/sync/engine/net/syncapi_server_connection_manager.cc',
         'browser/sync/engine/net/syncapi_server_connection_manager.h',
@@ skipping 722 matching lines @@
       }],  # targets
     }],  # OS=="linux" or OS=="freebsd"
   ],  # 'conditions'
 }
 
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 # tab-width:2
 # indent-tabs-mode:nil
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