arc: Provide UMA for OptIn flow.

chrome/browser/chromeos/arc/arc_optin_uma.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 "chrome/browser/chromeos/arc/arc_optin_uma.h"
 
 #include <string>
 
 #include "base/metrics/histogram_functions.h"
 #include "base/metrics/histogram_macros.h"
 
 namespace arc {
 
 void UpdateOptInActionUMA(OptInActionType type) {
   UMA_HISTOGRAM_ENUMERATION("Arc.OptInAction", static_cast<int>(type),
                             static_cast<int>(OptInActionType::SIZE));
 }
 
 void UpdateOptInCancelUMA(OptInCancelReason reason) {
   UMA_HISTOGRAM_ENUMERATION("Arc.OptInCancel", static_cast<int>(reason),
                             static_cast<int>(OptInCancelReason::SIZE));
 }
 
 void UpdateEnabledStateUMA(bool enabled) {
   UMA_HISTOGRAM_BOOLEAN("Arc.State", enabled);
 }
 
+void UpdateOptInFlowResultUMA(OptInFlowResult result) {
+  UMA_HISTOGRAM_ENUMERATION("Arc.OptInResult", static_cast<int>(result),
+                            static_cast<int>(OptInFlowResult::SIZE));
+}
+
 void UpdateProvisioningResultUMA(ProvisioningResult result, bool managed) {
   DCHECK_NE(result, ProvisioningResult::CHROME_SERVER_COMMUNICATION_ERROR);
   std::string histogram_name = "Arc.Provisioning.Result.";
   histogram_name += managed ? "Managed" : "Unmanaged";
   base::LinearHistogram::FactoryGet(
       histogram_name, 0, static_cast<int>(ProvisioningResult::SIZE),
       static_cast<int>(ProvisioningResult::SIZE) + 1,
       base::HistogramBase::kUmaTargetedHistogramFlag)
       ->Add(static_cast<int>(result));
 }
@@ skipping 70 matching lines @@
 
 #undef MAP_PROVISIONING_RESULT
 
   // Some compilers report an error even if all values of an enum-class are
   // covered exhaustively in a switch statement.
   NOTREACHED() << "Invalid value " << static_cast<int>(result);
   return os;
 }
 
 }  // namespace arc