media: Add ServiceFactory mojo interface and implementation.

media/mojo/services/mojo_cdm_service.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/mojo/services/mojo_cdm_service.h"
 
 #include "base/bind.h"
 #include "media/base/cdm_config.h"
 #include "media/base/cdm_factory.h"
 #include "media/base/cdm_key_information.h"
 #include "media/base/key_systems.h"
 #include "media/mojo/services/media_type_converters.h"
 #include "media/mojo/services/mojo_cdm_service_context.h"
 #include "mojo/common/common_type_converters.h"
 #include "mojo/common/url_type_converters.h"
 #include "url/gurl.h"
 
 namespace media {
 
 using NewSessionMojoCdmPromise = MojoCdmPromise<std::string>;
 using SimpleMojoCdmPromise = MojoCdmPromise<>;
 
 MojoCdmService::MojoCdmService(
-    MojoCdmServiceContext* context,
+    base::WeakPtr<MojoCdmServiceContext> context,
     mojo::ServiceProvider* service_provider,
     CdmFactory* cdm_factory,
     mojo::InterfaceRequest<interfaces::ContentDecryptionModule> request)
     : binding_(this, request.Pass()),
       context_(context),
       service_provider_(service_provider),
       cdm_factory_(cdm_factory),
       cdm_id_(CdmContext::kInvalidCdmId),
       weak_factory_(this) {
   DCHECK(context_);
   DCHECK(cdm_factory_);
 }
 
 MojoCdmService::~MojoCdmService() {
-  if (cdm_id_ != CdmContext::kInvalidCdmId)
+  if (cdm_id_ != CdmContext::kInvalidCdmId && context_)
     context_->UnregisterCdm(cdm_id_);
 }
 
 void MojoCdmService::SetClient(
     interfaces::ContentDecryptionModuleClientPtr client) {
   client_ = client.Pass();
 }
 
 void MojoCdmService::Initialize(
     const mojo::String& key_system,
@@ skipping 85 matching lines @@
 CdmContext* MojoCdmService::GetCdmContext() {
   return cdm_->GetCdmContext();
 }
 
 void MojoCdmService::OnCdmCreated(int cdm_id,
                                   scoped_ptr<SimpleMojoCdmPromise> promise,
                                   scoped_ptr<MediaKeys> cdm,
                                   const std::string& error_message) {
   // TODO(xhwang): This should not happen when KeySystemInfo is properly
   // populated. See http://crbug.com/469366
-  if (!cdm) {
+  if (!cdm || !context_) {
     promise->reject(MediaKeys::NOT_SUPPORTED_ERROR, 0, error_message);
     return;
   }
 
   cdm_ = cdm.Pass();
   cdm_id_ = cdm_id;
   context_->RegisterCdm(cdm_id_, this);
   promise->resolve();
 }
 
@@ skipping 36 matching lines @@
                                           MediaKeys::Exception exception,
                                           uint32_t system_code,
                                           const std::string& error_message) {
   DVLOG(2) << __FUNCTION__;
   client_->OnLegacySessionError(
       session_id, static_cast<interfaces::CdmException>(exception), system_code,
       error_message);
 }
 
 }  // namespace media