Modifications for recording whether UMA/Crash default state for iOS

components/metrics/metrics_reporting_default_state.cc

+// Copyright 2016 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.
+
+#include "components/metrics/metrics_reporting_default_state.h"
+
+#include "components/metrics/metrics_pref_names.h"
+#include "components/prefs/pref_registry_simple.h"
+#include "components/prefs/pref_service.h"
+
+namespace metrics {
+
+void RegisterMetricsReportingStatePrefs(PrefRegistrySimple* registry) {
+  registry->RegisterIntegerPref(prefs::kMetricsDefaultOptIn,
+                                MetricsServiceClient::DEFAULT_UNKNOWN);
+}
+
+void RecordMetricsReportingDefaultOptIn(PrefService* local_state, bool opt_in) {
+  DCHECK(GetMetricsReportingDefaultOptIn(local_state) ==
+         MetricsServiceClient::DEFAULT_UNKNOWN);
+  local_state->SetInteger(
+      prefs::kMetricsDefaultOptIn,
+      opt_in ? MetricsServiceClient::OPT_IN : MetricsServiceClient::OPT_OUT);
+}
+
+MetricsServiceClient::EnableMetricsDefault GetMetricsReportingDefaultOptIn(
+    PrefService* local_state) {
+  return static_cast<MetricsServiceClient::EnableMetricsDefault>(
+      local_state->GetInteger(prefs::kMetricsDefaultOptIn));
+}
+
+}  // namespace metrics