Move API for field trial params to base from variations.

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 543 matching lines @@
     "message_loop/message_pump_mac.mm",
     "message_loop/message_pump_win.cc",
     "message_loop/message_pump_win.h",
     "message_loop/timer_slack.h",
     "metrics/bucket_ranges.cc",
     "metrics/bucket_ranges.h",
     "metrics/field_trial.cc",
     "metrics/field_trial.h",
     "metrics/field_trial_param_associator.cc",
     "metrics/field_trial_param_associator.h",
+    "metrics/field_trial_params.cc",
+    "metrics/field_trial_params.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",
     "metrics/histogram_flattener.h",
     "metrics/histogram_functions.cc",
     "metrics/histogram_functions.h",
     "metrics/histogram_macros.h",
@@ skipping 1370 matching lines @@
     "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/bucket_ranges_unittest.cc",
+    "metrics/field_trial_params_unittest.cc",
     "metrics/field_trial_unittest.cc",
     "metrics/histogram_base_unittest.cc",
     "metrics/histogram_delta_serialization_unittest.cc",
     "metrics/histogram_functions_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 625 matching lines @@
 }
 
 fuzzer_test("base_json_correctness_fuzzer") {
   sources = [
     "json/correctness_fuzzer.cc",
   ]
   deps = [
     ":base",
   ]
 }