[Startup Tracing] Add --trace-config-file flag

components/tracing.gyp

 # 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.
 
 # This file is intentionally a gyp file rather than a gypi for dependencies
 # reasons. The other gypi files include content.gyp and content_common depends
 # on this, thus if you try to rename this to gypi and include it in
 # components.gyp, you will get a circular dependency error.
 {
@@ skipping 12 matching lines @@
         '..',
       ],
       'defines': [
         'TRACING_IMPLEMENTATION=1',
       ],
       'sources': [
         'tracing/child_memory_dump_manager_delegate_impl.cc',
         'tracing/child_memory_dump_manager_delegate_impl.h',
         'tracing/child_trace_message_filter.cc',
         'tracing/child_trace_message_filter.h',
-        'tracing/startup_tracing.cc',
-        'tracing/startup_tracing.h',
+        'tracing/trace_config_file.cc',
+        'tracing/trace_config_file.h',
         'tracing/tracing_export.h',
         'tracing/tracing_messages.cc',
         'tracing/tracing_messages.h',
         'tracing/tracing_switches.cc',
         'tracing/tracing_switches.h',
       ],
     },
   ],
 }