Modifications for recording whether UMA/Crash default state for iOS

components/metrics/metrics_pref_names.h

 // 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.
 
 #ifndef COMPONENTS_METRICS_METRICS_PREF_NAMES_H_
 #define COMPONENTS_METRICS_METRICS_PREF_NAMES_H_
 
 namespace metrics {
 namespace prefs {
 
 // Alphabetical list of preference names specific to the metrics
 // component. Document each in the .cc file.
 extern const char kInstallDate[];
 extern const char kMetricsClientID[];
+extern const char kMetricsDefaultOptIn[];
 extern const char kMetricsInitialLogs[];
 extern const char kMetricsLowEntropySource[];
 extern const char kMetricsMachineId[];
 extern const char kMetricsOngoingLogs[];
 extern const char kMetricsResetIds[];
 
 // For finding out whether metrics and crash reporting is enabled use the
 // relevant embedder-specific subclass of MetricsServiceAccessor instead of
 // reading this pref directly; see the comments on metrics_service_accessor.h.
 // (NOTE: If within //chrome, use
@@ skipping 30 matching lines @@
 extern const char kUninstallMetricsUptimeSec[];
 
 // For measuring data use for throttling UMA log uploads on cellular.
 extern const char kUmaCellDataUse[];
 extern const char kUserCellDataUse[];
 
 }  // namespace prefs
 }  // namespace metrics
 
 #endif  // COMPONENTS_METRICS_METRICS_PREF_NAMES_H_