Remove dependency on cc::TestNowSource from scheduler code

content/content_tests.gypi

 # Copyright (c) 2013 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': {
     'layouttest_support_content_sources': [
       'public/test/layouttest_support.h',
       'public/test/nested_message_pump_android.cc',
       'public/test/nested_message_pump_android.h',
@@ skipping 145 matching lines @@
       'test/test_navigation_url_loader_factory.cc',
       'test/test_navigation_url_loader_factory.h',
       'test/test_render_frame_host.cc',
       'test/test_render_frame_host.h',
       'test/test_render_frame_host_factory.cc',
       'test/test_render_frame_host_factory.h',
       'test/test_render_view_host.cc',
       'test/test_render_view_host.h',
       'test/test_render_view_host_factory.cc',
       'test/test_render_view_host_factory.h',
+      'test/test_time_source.cc',
+      'test/test_time_source.h',
       'test/test_web_contents.cc',
       'test/test_web_contents.h',
       'test/test_web_contents_factory.cc',
       'test/web_gesture_curve_mock.cc',
       'test/web_gesture_curve_mock.h',
       'test/web_layer_tree_view_impl_for_testing.cc',
       'test/web_layer_tree_view_impl_for_testing.h',
       'test/weburl_loader_mock.cc',
       'test/weburl_loader_mock.h',
       'test/weburl_loader_mock_factory.cc',
@@ skipping 1973 matching lines @@
                   'files': ['<(PRODUCT_DIR)/libnpapi_test_plugin.so'],
                 },
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }