Add minimal CalculateIdleState implementation for Android.

chrome/chrome_browser.gypi

 # Copyright (c) 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 1466 matching lines @@
         'browser/icon_loader_linux.cc',
         'browser/icon_loader_mac.mm',
         'browser/icon_loader_win.cc',
         'browser/icon_manager.cc',
         'browser/icon_manager.h',
         'browser/icon_manager_android.cc',
         'browser/icon_manager_chromeos.cc',
         'browser/icon_manager_linux.cc',
         'browser/icon_manager_mac.mm',
         'browser/icon_manager_win.cc',
+        'browser/idle_android.cc',
         'browser/idle_chromeos.cc',
         'browser/idle_linux.cc',
         'browser/idle_mac.mm',
         'browser/idle_query_linux.cc',
         'browser/idle_query_linux.h',
         'browser/idle_win.cc',
         'browser/image_decoder.cc',
         'browser/image_decoder.h',
         'browser/importer/external_process_importer_bridge.cc',
         'browser/importer/external_process_importer_bridge.h',
@@ skipping 4074 matching lines @@
       'type': 'static_library',
       'sources': [ 'browser/history/in_memory_url_index_cache.proto' ],
       'variables': {
         'proto_in_dir': 'browser/history',
         'proto_out_dir': 'chrome/browser/history',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }