Add tracing AutoOpenCloseEvent.

base/BUILD.gn

 # 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.
 
 # HOW TO WRITE CONDITIONALS IN THIS FILE
 # ======================================
 #
 # In many other places, one would write a conditional that expresses all the
 # cases when a source file is used or unused, and then either add or subtract
 # it from the sources list in that case
@@ skipping 890 matching lines @@
     "trace_event/memory_allocator_dump_guid.h",
     "trace_event/memory_dump_manager.cc",
     "trace_event/memory_dump_manager.h",
     "trace_event/memory_dump_provider.h",
     "trace_event/memory_dump_request_args.cc",
     "trace_event/memory_dump_request_args.h",
     "trace_event/memory_dump_session_state.cc",
     "trace_event/memory_dump_session_state.h",
     "trace_event/memory_infra_background_whitelist.cc",
     "trace_event/memory_infra_background_whitelist.h",
+    "trace_event/persistent_async_event.cc",
+    "trace_event/persistent_async_event.h",
     "trace_event/process_memory_dump.cc",
     "trace_event/process_memory_dump.h",
     "trace_event/process_memory_maps.cc",
     "trace_event/process_memory_maps.h",
     "trace_event/process_memory_totals.cc",
     "trace_event/process_memory_totals.h",
     "trace_event/trace_buffer.cc",
     "trace_event/trace_buffer.h",
     "trace_event/trace_config.cc",
     "trace_event/trace_config.h",
@@ skipping 11 matching lines @@
     "trace_event/trace_event_synthetic_delay.h",
     "trace_event/trace_event_system_stats_monitor.cc",
     "trace_event/trace_event_system_stats_monitor.h",
     "trace_event/trace_log.cc",
     "trace_event/trace_log.h",
     "trace_event/trace_log_constants.cc",
     "trace_event/trace_sampling_thread.cc",
     "trace_event/trace_sampling_thread.h",
     "trace_event/tracing_agent.cc",
     "trace_event/tracing_agent.h",
+    "trace_event/vfc_persistent_async_event.cc",
+    "trace_event/vfc_persistent_async_event.h",
     "trace_event/winheap_dump_provider_win.cc",
     "trace_event/winheap_dump_provider_win.h",
     "tracked_objects.cc",
     "tracked_objects.h",
     "tracking_info.cc",
     "tracking_info.h",
     "tuple.h",
     "value_conversions.cc",
     "value_conversions.h",
     "values.cc",
@@ skipping 1469 matching lines @@
 
   # GYP: //base.gyp:base_java_unittest_support
   android_library("base_java_unittest_support") {
     deps = [
       ":base_java",
     ]
     java_files =
         [ "test/android/java/src/org/chromium/base/ContentUriTestUtils.java" ]
   }
 }