Implement FromDict/IntoDict for BackgroundTracingConfig.

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 550 matching lines @@
       'browser/shareable_file_reference_unittest.cc',
       'browser/shared_worker/shared_worker_instance_unittest.cc',
       'browser/shared_worker/shared_worker_service_impl_unittest.cc',
       'browser/site_instance_impl_unittest.cc',
       'browser/startup_task_runner_unittest.cc',
       'browser/storage_partition_impl_map_unittest.cc',
       'browser/storage_partition_impl_unittest.cc',
       'browser/streams/stream_unittest.cc',
       'browser/streams/stream_url_request_job_unittest.cc',
       'browser/system_message_window_win_unittest.cc',
+      'browser/tracing/background_tracing_config_unittest.cc',
       'browser/web_contents/aura/overscroll_navigation_overlay_unittest.cc',
       'browser/web_contents/aura/overscroll_window_animation_unittest.cc',
       'browser/web_contents/aura/overscroll_window_delegate_unittest.cc',
       'browser/web_contents/web_contents_delegate_unittest.cc',
       'browser/web_contents/web_contents_impl_unittest.cc',
       'browser/web_contents/web_contents_user_data_unittest.cc',
       'browser/web_contents/web_contents_view_mac_unittest.mm',
       'browser/web_contents/web_drag_dest_mac_unittest.mm',
       'browser/web_contents/web_drag_source_mac_unittest.mm',
       'browser/webui/url_data_manager_backend_unittest.cc',
@@ skipping 1569 matching lines @@
                   'files': ['<(PRODUCT_DIR)/libnpapi_test_plugin.so'],
                 },
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }