Add various UMA histograms for measuring GCM crypto performance

components/gcm_driver/gcm_client.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_CLIENT_H_
 #define COMPONENTS_GCM_DRIVER_GCM_CLIENT_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 251 matching lines @@
 
   // Sends a message to a given receiver. Delegate::OnSendFinished will be
   // called asynchronously upon completion.
   // |app_id|: application ID.
   // |receiver_id|: registration ID of the receiver party.
   // |message|: message to be sent.
   virtual void Send(const std::string& app_id,
                     const std::string& receiver_id,
                     const OutgoingMessage& message) = 0;
 
-  // Records a decryption failure due to |reason| for the |app_id|.
+  // Records a decryption failure due to |result| for the |app_id|.
   virtual void RecordDecryptionFailure(
       const std::string& app_id,
-      GCMEncryptionProvider::DecryptionFailure reason) = 0;
+      GCMEncryptionProvider::DecryptionResult result) = 0;
 
   // Enables or disables internal activity recording.
   virtual void SetRecording(bool recording) = 0;
 
   // Clear all recorded GCM activity logs.
   virtual void ClearActivityLogs() = 0;
 
   // Gets internal states and statistics.
   virtual GCMStatistics GetStatistics() const = 0;
 
@@ skipping 35 matching lines @@
   // to be set, and allows that component to later revoke the setting. It should
   // be unique.
   virtual void AddHeartbeatInterval(const std::string& scope,
                                     int interval_ms) = 0;
   virtual void RemoveHeartbeatInterval(const std::string& scope) = 0;
 };
 
 }  // namespace gcm
 
 #endif  // COMPONENTS_GCM_DRIVER_GCM_CLIENT_H_