Add various UMA histograms for measuring GCM crypto performance

components/gcm_driver/gcm_stats_recorder_android.cc

 // Copyright 2015 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 <stddef.h>
 
 #include "components/gcm_driver/gcm_stats_recorder_android.h"
 
 namespace gcm {
 
@@ skipping 105 matching lines @@
   receiving_activities_.push_front(activity);
   if (receiving_activities_.size() > MAX_LOGGED_ACTIVITY_COUNT)
     receiving_activities_.pop_back();
 
   if (delegate_)
     delegate_->OnActivityRecorded();
 }
 
 void GCMStatsRecorderAndroid::RecordDecryptionFailure(
     const std::string& app_id,
-    GCMEncryptionProvider::DecryptionFailure reason) {
+    GCMEncryptionProvider::DecryptionResult result) {
+  DCHECK_NE(result, GCMEncryptionProvider::DECRYPTION_RESULT_UNENCRYPTED);
+  DCHECK_NE(result, GCMEncryptionProvider::DECRYPTION_RESULT_DECRYPTED);
   if (!is_recording_)
     return;
 
   DecryptionFailureActivity activity;
   activity.app_id = app_id;
   activity.details =
-      GCMEncryptionProvider::ToDecryptionFailureDetailsString(reason);
+      GCMEncryptionProvider::ToDecryptionResultDetailsString(result);
 
   decryption_failure_activities_.push_front(activity);
   if (decryption_failure_activities_.size() > MAX_LOGGED_ACTIVITY_COUNT)
     decryption_failure_activities_.pop_back();
 
   if (delegate_)
     delegate_->OnActivityRecorded();
 }
 
 }  // namespace gcm