Add various UMA histograms for measuring GCM crypto performance

components/gcm_driver/gcm_stats_recorder_impl.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_GCM_DRIVER_GCM_STATS_RECORDER_IMPL_H_
 #define COMPONENTS_GCM_DRIVER_GCM_STATS_RECORDER_IMPL_H_
 
 #include <stdint.h>
 
 #include <deque>
@@ skipping 21 matching lines @@
  public:
   GCMStatsRecorderImpl();
   ~GCMStatsRecorderImpl() override;
 
   // Set a delegate to receive callback from the recorder.
   void SetDelegate(Delegate* delegate);
 
   // Clear all recorded activities.
   void Clear();
 
-  // Records a message decryption failure caused by |reason| for |app_id|.
+  // Records a message decryption failure caused by |result| for |app_id|.
   void RecordDecryptionFailure(const std::string& app_id,
-                               GCMEncryptionProvider::DecryptionFailure reason);
+                               GCMEncryptionProvider::DecryptionResult result);
 
   // GCMStatsRecorder implementation:
   void RecordCheckinInitiated(uint64_t android_id) override;
   void RecordCheckinDelayedDueToBackoff(int64_t delay_msec) override;
   void RecordCheckinSuccess() override;
   void RecordCheckinFailure(const std::string& status,
                             bool will_retry) override;
   void RecordConnectionInitiated(const std::string& host) override;
   void RecordConnectionDelayedDueToBackoff(int64_t delay_msec) override;
   void RecordConnectionSuccess() override;
@@ skipping 108 matching lines @@
   base::TimeTicks last_received_data_message_burst_start_time_;
   base::TimeTicks last_received_data_message_time_within_burst_;
   int64_t received_data_message_burst_size_;
 
   DISALLOW_COPY_AND_ASSIGN(GCMStatsRecorderImpl);
 };
 
 }  // namespace gcm
 
 #endif  // COMPONENTS_GCM_DRIVER_GCM_STATS_RECORDER_IMPL_H_