Add various UMA histograms for measuring GCM crypto performance

components/gcm_driver/gcm_driver.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_DRIVER_H_
 #define COMPONENTS_GCM_DRIVER_GCM_DRIVER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 242 matching lines @@
                                           const std::string& sender_id);
 
   // Platform-specific implementation of Send.
   virtual void SendImpl(const std::string& app_id,
                         const std::string& receiver_id,
                         const OutgoingMessage& message) = 0;
 
   // Platform-specific implementation of recording message decryption failures.
   virtual void RecordDecryptionFailure(
       const std::string& app_id,
-      GCMEncryptionProvider::DecryptionFailure reason) = 0;
+      GCMEncryptionProvider::DecryptionResult result) = 0;
 
   // Runs the Register callback.
   void RegisterFinished(const std::string& app_id,
                         const std::string& registration_id,
                         GCMClient::Result result);
 
   // To be called when a registration for |app_id| has been unregistered, having
   // |result| as the result of the unregistration. Will remove any encryption
   // information associated with the |app_id| and then calls UnregisterFinished.
   void RemoveEncryptionInfoAfterUnregister(const std::string& app_id,
@@ skipping 17 matching lines @@
   // |message| will be dispatched immediately to the handler for |app_id|.
   void DispatchMessage(const std::string& app_id,
                        const IncomingMessage& message);
 
  private:
   // Common code shared by Unregister and UnregisterWithSenderId.
   void UnregisterInternal(const std::string& app_id,
                           const std::string* sender_id,
                           const UnregisterCallback& callback);
 
+  // Dispatches the OnMessage event to the app handler associated with |app_id|
+  // if |result| indicates that it is safe to do so, or will report a decryption
+  // failure for the |app_id| otherwise.
+  void DispatchMessageInternal(const std::string& app_id,
+                               GCMEncryptionProvider::DecryptionResult result,
+                               const IncomingMessage& message);
+
   // Called after unregistration completes in order to trigger the pending
   // registration.
   void RegisterAfterUnregister(
       const std::string& app_id,
       const std::vector<std::string>& normalized_sender_ids,
       const UnregisterCallback& unregister_callback,
       GCMClient::Result result);
 
   // Callback map (from app_id to callback) for Register.
   std::map<std::string, RegisterCallback> register_callbacks_;
@@ skipping 16 matching lines @@
   DefaultGCMAppHandler default_app_handler_;
 
   base::WeakPtrFactory<GCMDriver> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GCMDriver);
 };
 
 }  // namespace gcm
 
 #endif  // COMPONENTS_GCM_DRIVER_GCM_DRIVER_H_