Modifications for recording whether UMA/Crash default state for iOS

components/metrics/metrics_reporting_default_state.h

Index: components/metrics/metrics_reporting_default_state.h
diff --git a/components/metrics/metrics_reporting_default_state.h b/components/metrics/metrics_reporting_default_state.h
new file mode 100644
index 0000000000000000000000000000000000000000..131e8a0ba5de8bb0e204862831590c8ada6a3bc3
--- /dev/null
+++ b/components/metrics/metrics_reporting_default_state.h
@@ -0,0 +1,32 @@
+// 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.
+
+#ifndef COMPONENTS_METRICS_METRICS_REPORTING_DEFAULT_STATE_H_
+#define COMPONENTS_METRICS_METRICS_REPORTING_DEFAULT_STATE_H_
+
+#include "components/metrics/metrics_service_client.h"
+
+class PrefRegistrySimple;
+class PrefService;
+
+namespace metrics {
+
+// Register prefs relating to metrics reporting state. Currently only registers
+// a pref for metrics reporting default opt-in state.
+void RegisterMetricsReportingStatePrefs(PrefRegistrySimple* registry);
+
+// Sets whether metrics reporting was opt-in or not. If it was opt-in, then the
+// enable checkbox on first-run was default unchecked. If it was opt-out, then
+// the checkbox was default checked. This should only be set once, and only
+// during first-run.
+void RecordMetricsReportingDefaultOptIn(PrefService* local_state, bool opt_in);
+
+// Gets information about the default value for the enable metrics reporting
+// checkbox shown during first-run.
+MetricsServiceClient::EnableMetricsDefault GetMetricsReportingDefaultOptIn(
+    PrefService* local_state);
+
+}  // namespace metrics
+
+#endif  // COMPONENTS_METRICS_METRICS_REPORTING_DEFAULT_STATE_H_