Add base::UnguessableToken

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 951 matching lines @@
     "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",
     "tracked_objects.cc",
     "tracked_objects.h",
     "tracking_info.cc",
     "tracking_info.h",
     "tuple.h",
+    "unguessable_token.cc",
+    "unguessable_token.h",
     "value_conversions.cc",
     "value_conversions.h",
     "values.cc",
     "values.h",
     "version.cc",
     "version.h",
     "vlog.cc",
     "vlog.h",
     "win/enum_variant.cc",
     "win/enum_variant.h",
@@ skipping 998 matching lines @@
     "trace_event/memory_allocator_dump_unittest.cc",
     "trace_event/memory_dump_manager_unittest.cc",
     "trace_event/process_memory_dump_unittest.cc",
     "trace_event/trace_config_unittest.cc",
     "trace_event/trace_event_argument_unittest.cc",
     "trace_event/trace_event_synthetic_delay_unittest.cc",
     "trace_event/trace_event_system_stats_monitor_unittest.cc",
     "trace_event/trace_event_unittest.cc",
     "tracked_objects_unittest.cc",
     "tuple_unittest.cc",
+    "unguessable_token_unittest.cc",
     "values_unittest.cc",
     "version_unittest.cc",
     "vlog_unittest.cc",
     "win/dllmain.cc",
     "win/enum_variant_unittest.cc",
     "win/event_trace_consumer_unittest.cc",
     "win/event_trace_controller_unittest.cc",
     "win/event_trace_provider_unittest.cc",
     "win/i18n_unittest.cc",
     "win/iunknown_impl_unittest.cc",
@@ skipping 455 matching lines @@
     testonly = true
     deps = [
       ":base_java",
     ]
     java_files = [
       "test/android/java/src/org/chromium/base/ContentUriTestUtils.java",
       "test/android/java/src/org/chromium/base/TestSystemMessageHandler.java",
     ]
   }
 }