Extract guts of ChromeStabilityMetricsProvider into helper class

components/metrics/BUILD.gn

 # Copyright 2014 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.
 
 # GYP version: components/metrics.gypi:metrics
 source_set("metrics") {
   sources = [
     "call_stack_profile_metrics_provider.cc",
     "call_stack_profile_metrics_provider.h",
     "clean_exit_beacon.cc",
@@ skipping 35 matching lines @@
     "metrics_service_accessor.cc",
     "metrics_service_accessor.h",
     "metrics_service_client.cc",
     "metrics_service_client.h",
     "metrics_state_manager.cc",
     "metrics_state_manager.h",
     "metrics_switches.cc",
     "metrics_switches.h",
     "persisted_logs.cc",
     "persisted_logs.h",
+    "stability_metrics_helper.cc",
+    "stability_metrics_helper.h",
+    "system_memory_stats_recorder.h",
+    "system_memory_stats_recorder_linux.cc",
+    "system_memory_stats_recorder_win.cc",
     "url_constants.cc",
     "url_constants.h",
   ]
 
   public_deps = [
     "//components/metrics/proto",
   ]
   deps = [
     "//base",
     "//base:i18n",
@@ skipping 123 matching lines @@
     "histogram_encoder_unittest.cc",
     "machine_id_provider_win_unittest.cc",
     "metrics_hashes_unittest.cc",
     "metrics_log_manager_unittest.cc",
     "metrics_log_unittest.cc",
     "metrics_reporting_scheduler_unittest.cc",
     "metrics_service_unittest.cc",
     "metrics_state_manager_unittest.cc",
     "net/net_metrics_log_uploader_unittest.cc",
     "persisted_logs_unittest.cc",
+    "stability_metrics_helper_unittest.cc",
   ]
 
   deps = [
     ":metrics",
     ":net",
     ":test_support",
     "//base:prefs_test_support",
     "//base/test:test_support",
     "//components/variations",
     "//testing/gtest",
@@ skipping 10 matching lines @@
       "profiler/profiler_metrics_provider_unittest.cc",
       "profiler/tracking_synchronizer_unittest.cc",
     ]
   }
   if (is_linux) {
     sources += [ "serialization/serialization_utils_unittest.cc" ]
     deps += [ ":serialization" ]
   }
 }
 # TODO(GYP): metrics_chromeos