media: Add UMA to record time to GenerateRequest and LoadSession

media/blink/webcontentdecryptionmodulesession_impl.cc

 // Copyright 2013 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 "webcontentdecryptionmodulesession_impl.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ skipping 342 matching lines @@
   // 10.6 Let message be null.
   // 10.7 Let message type be null.
   //      (Done by CDM.)
 
   // 10.8 Let cdm be the CDM instance represented by this object's cdm
   //      instance value.
   // 10.9 Use the cdm to execute the following steps:
   adapter_->InitializeNewSession(
       eme_init_data_type, sanitized_init_data, convertSessionType(session_type),
       std::unique_ptr<NewSessionCdmPromise>(new NewSessionCdmResultPromise(
-          result, adapter_->GetKeySystemUMAPrefix() + kGenerateRequestUMAName,
+          result, adapter_->GetKeySystemUMAPrefix(), kGenerateRequestUMAName,
           base::Bind(
               &WebContentDecryptionModuleSessionImpl::OnSessionInitialized,
               weak_ptr_factory_.GetWeakPtr()))));
 }
 
 void WebContentDecryptionModuleSessionImpl::load(
     const blink::WebString& session_id,
     blink::WebContentDecryptionModuleResult result) {
   DCHECK(!session_id.isEmpty());
   DCHECK(session_id_.empty());
@@ skipping 13 matching lines @@
         "Invalid session ID.");
     return;
   }
 
   // TODO(jrummell): Now that there are 2 types of persistent sessions, the
   // session type should be passed from blink. Type should also be passed in the
   // constructor (and removed from initializeNewSession()).
   adapter_->LoadSession(
       CdmSessionType::PERSISTENT_LICENSE_SESSION, sanitized_session_id,
       std::unique_ptr<NewSessionCdmPromise>(new NewSessionCdmResultPromise(
-          result, adapter_->GetKeySystemUMAPrefix() + kLoadSessionUMAName,
+          result, adapter_->GetKeySystemUMAPrefix(), kLoadSessionUMAName,
           base::Bind(
               &WebContentDecryptionModuleSessionImpl::OnSessionInitialized,
               weak_ptr_factory_.GetWeakPtr()))));
 }
 
 void WebContentDecryptionModuleSessionImpl::update(
     const uint8_t* response,
     size_t response_length,
     blink::WebContentDecryptionModuleResult result) {
   DCHECK(response);
@@ skipping 117 matching lines @@
 
   DCHECK(session_id_.empty()) << "Session ID may not be changed once set.";
   session_id_ = session_id;
   *status =
       adapter_->RegisterSession(session_id_, weak_ptr_factory_.GetWeakPtr())
           ? SessionInitStatus::NEW_SESSION
           : SessionInitStatus::SESSION_ALREADY_EXISTS;
 }
 
 }  // namespace media