Ensures that audio tasks cannot run after AudioManager is deleted.

content/browser/renderer_host/media/audio_output_delegate_impl_unittest.cc

 // Copyright 2016 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 "content/browser/renderer_host/media/audio_output_delegate_impl.h"
 
 #include <stdint.h>
 
 #include <memory>
 #include <utility>
@@ skipping 102 matching lines @@
         TestBrowserThreadBundle::Options::REAL_IO_THREAD);
     audio_thread_ = base::MakeUnique<AudioManagerThread>();
 
     audio_manager_.reset(new media::FakeAudioManager(
         audio_thread_->task_runner(), audio_thread_->worker_task_runner(),
         &log_factory_));
     audio_system_ = media::AudioSystemImpl::Create(audio_manager_.get());
     media_stream_manager_ =
         base::MakeUnique<MediaStreamManager>(audio_system_.get());
   }
+  ~AudioOutputDelegateTest() {
+    audio_manager_->GetTaskRunner()->PostTask(
+        FROM_HERE, base::Bind(&media::AudioManager::Shutdown,
+                              base::Unretained(audio_manager_.get())));
+  }
 
   // Test bodies are here, so that we can run them on the IO thread.
   void CreateTest(base::Closure done) {
     EXPECT_CALL(media_observer_,
                 OnCreatingAudioStream(kRenderProcessId, kRenderFrameId));
     EXPECT_CALL(event_handler_,
                 OnStreamCreated(kStreamId, NotNull(), NotNull()));
     EXPECT_CALL(mirroring_manager_,
                 AddDiverter(kRenderProcessId, kRenderFrameId, NotNull()));
 
@@ skipping 310 matching lines @@
     }
     SyncWithAllThreads();
     BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, done);
   }
 
  protected:
   // MediaStreamManager uses a DestructionObserver, so it must outlive the
   // TestBrowserThreadBundle.
   std::unique_ptr<MediaStreamManager> media_stream_manager_;
   std::unique_ptr<TestBrowserThreadBundle> thread_bundle_;
+  std::unique_ptr<media::AudioManager> audio_manager_;
   std::unique_ptr<AudioManagerThread> audio_thread_;
-  media::ScopedAudioManagerPtr audio_manager_;
   std::unique_ptr<media::AudioSystem> audio_system_;
   StrictMock<MockAudioMirroringManager> mirroring_manager_;
   StrictMock<MockEventHandler> event_handler_;
   StrictMock<MockObserver> media_observer_;
   media::FakeAudioLogFactory log_factory_;
 
  private:
   void SyncWithAllThreads() {
     DCHECK_CURRENTLY_ON(BrowserThread::IO);
     // New tasks might be posted while we are syncing, but in every iteration at
@@ skipping 108 matching lines @@
 TEST_F(AudioOutputDelegateTest, ErrorAndDestroy) {
   base::RunLoop l;
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       base::Bind(&AudioOutputDelegateTest::PlayAndDestroyTest,
                  base::Unretained(this), l.QuitClosure()));
   l.Run();
 }
 
 }  // namespace content