Track thread activities in order to diagnose hangs.

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 487 matching lines @@
     "message_loop/message_pump_glib.cc",
     "message_loop/message_pump_glib.h",
     "message_loop/message_pump_io_ios.cc",
     "message_loop/message_pump_io_ios.h",
     "message_loop/message_pump_libevent.cc",
     "message_loop/message_pump_libevent.h",
     "message_loop/message_pump_mac.h",
     "message_loop/message_pump_mac.mm",
     "message_loop/message_pump_win.cc",
     "message_loop/message_pump_win.h",
+    "metrics/activity_tracker.cc",
+    "metrics/activity_tracker.h",
     "metrics/bucket_ranges.cc",
     "metrics/bucket_ranges.h",
     "metrics/field_trial.cc",
     "metrics/field_trial.h",
     "metrics/histogram.cc",
     "metrics/histogram.h",
     "metrics/histogram_base.cc",
     "metrics/histogram_base.h",
     "metrics/histogram_delta_serialization.cc",
     "metrics/histogram_delta_serialization.h",
@@ skipping 1265 matching lines @@
     "memory/scoped_vector_unittest.cc",
     "memory/shared_memory_mac_unittest.cc",
     "memory/shared_memory_unittest.cc",
     "memory/shared_memory_win_unittest.cc",
     "memory/singleton_unittest.cc",
     "memory/weak_ptr_unittest.cc",
     "message_loop/message_loop_task_runner_unittest.cc",
     "message_loop/message_loop_unittest.cc",
     "message_loop/message_pump_glib_unittest.cc",
     "message_loop/message_pump_io_ios_unittest.cc",
+    "metrics/activity_tracker_unittest.cc",
     "metrics/bucket_ranges_unittest.cc",
     "metrics/field_trial_unittest.cc",
     "metrics/histogram_base_unittest.cc",
     "metrics/histogram_delta_serialization_unittest.cc",
     "metrics/histogram_macros_unittest.cc",
     "metrics/histogram_snapshot_manager_unittest.cc",
     "metrics/histogram_unittest.cc",
     "metrics/metrics_hashes_unittest.cc",
     "metrics/persistent_histogram_allocator_unittest.cc",
     "metrics/persistent_memory_allocator_unittest.cc",
@@ skipping 570 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" ]
   }
 }