media: Make MediaKeys ref-counted.

media/blink/cdm_session_adapter.cc

 // 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.
 
 #include "media/blink/cdm_session_adapter.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/stl_util.h"
@@ skipping 110 matching lines @@
 
 const std::string& CdmSessionAdapter::GetKeySystem() const {
   return key_system_;
 }
 
 const std::string& CdmSessionAdapter::GetKeySystemUMAPrefix() const {
   DCHECK(!key_system_uma_prefix_.empty());
   return key_system_uma_prefix_;
 }
 
-void CdmSessionAdapter::OnCdmCreated(
-    const std::string& key_system,
-    base::TimeTicks start_time,
-    scoped_ptr<MediaKeys> cdm,
-    const std::string& error_message) {
+void CdmSessionAdapter::OnCdmCreated(const std::string& key_system,
+                                     base::TimeTicks start_time,
+                                     const scoped_refptr<MediaKeys>& cdm,
+                                     const std::string& error_message) {
   DVLOG(2) << __FUNCTION__;
   DCHECK(!cdm_);
 
   TRACE_EVENT_ASYNC_END2("media", "CdmSessionAdapter::CreateCdm", trace_id_,
                          "success", (cdm ? "true" : "false"), "error_message",
                          error_message);
 
   if (!cdm) {
     cdm_created_result_->completeWithError(
         blink::WebContentDecryptionModuleExceptionNotSupportedError, 0,
         blink::WebString::fromUTF8(error_message));
     cdm_created_result_.reset();
     return;
   }
 
   key_system_ = key_system;
   key_system_uma_prefix_ =
       kMediaEME + GetKeySystemNameForUMA(key_system) + kDot;
 
   // Only report time for successful CDM creation.
   ReportTimeToCreateCdmUMA(base::TimeTicks::Now() - start_time);
 
-  cdm_ = cdm.Pass();
+  cdm_ = cdm;
 
   cdm_created_result_->completeWithContentDecryptionModule(
       new WebContentDecryptionModuleImpl(this));
   cdm_created_result_.reset();
 }
 
 void CdmSessionAdapter::OnSessionMessage(
     const std::string& session_id,
     MediaKeys::MessageType message_type,
     const std::vector<uint8_t>& message,
@@ skipping 56 matching lines @@
   // Note: This leaks memory, which is expected behavior.
   base::HistogramBase* histogram = base::Histogram::FactoryTimeGet(
       GetKeySystemUMAPrefix() + kTimeToCreateCdmUMAName,
       base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromSeconds(10),
       50, base::HistogramBase::kUmaTargetedHistogramFlag);
 
   histogram->AddTime(time);
 }
 
 }  // namespace media