Modifications for recording whether UMA/Crash default state for iOS

components/metrics/metrics_pref_names.cc

 // 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.
 
 #include "components/metrics/metrics_pref_names.h"
 
 namespace metrics {
 namespace prefs {
 
 // Set once, to the current epoch time, on the first run of chrome on this
 // machine. Attached to metrics reports forever thereafter.
 const char kInstallDate[] = "uninstall_metrics.installation_date2";
 
 // The metrics client GUID.
 // Note: The name client_id2 is a result of creating
 // new prefs to do a one-time reset of the previous values.
 const char kMetricsClientID[] = "user_experience_metrics.client_id2";
 
+// An enum value indicating the default value of the enable metrics reporting
+// checkbox shown during first-run. If it's opt-in, then the checkbox defaulted
+// to unchecked, if it's opt-out, then it defaulted to checked. This value is
+// only recorded during first-run, so older clients will not set it. The enum
+// used for the value is metrics::MetricsServiceClient::EnableMetricsDefault.
+const char kMetricsDefaultOptIn[] = "user_experience_metrics.default_opt_in";
+
 // Array of strings that are each UMA logs that were supposed to be sent in the
 // first minute of a browser session. These logs include things like crash count
 // info, etc.
 const char kMetricsInitialLogs[] =
     "user_experience_metrics.initial_logs_list";
 
 // The metrics entropy source.
 // Note: The name low_entropy_source2 is a result of creating
 // new prefs to do a one-time reset of the previous values.
 const char kMetricsLowEntropySource[] =
@@ skipping 143 matching lines @@
 // Dictionary for measuring cellular data used by UMA service during last 7
 // days.
 const char kUmaCellDataUse[] = "user_experience_metrics.uma_cell_datause";
 
 // Dictionary for measuring cellular data used by user including chrome services
 // per day.
 const char kUserCellDataUse[] = "user_experience_metrics.user_call_datause";
 
 }  // namespace prefs
 }  // namespace metrics