Add a hang monitor for the audio thread.

content/browser/browser_main_loop.cc

 // Copyright (c) 2012 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/browser_main_loop.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 498 matching lines @@
     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:NetworkChangeNotifier");
     network_change_notifier_.reset(net::NetworkChangeNotifier::Create());
   }
 
 #if !defined(OS_IOS)
   {
     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MediaFeatures");
     media::InitializeCPUSpecificMediaFeatures();
   }
   {
-    TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:AudioMan");
-    audio_manager_.reset(media::AudioManager::Create(
-        MediaInternals::GetInstance()));
-  }
-  {
-    TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MidiManager");
-    midi_manager_.reset(media::MidiManager::Create());
-  }
-  {
     TRACE_EVENT0("startup",
                  "BrowserMainLoop::Subsystem:ContentWebUIController");
     WebUIControllerFactory::RegisterFactory(
         ContentWebUIControllerFactory::GetInstance());
   }
 
   {
     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:OnlineStateObserver");
     online_state_observer_.reset(new BrowserOnlineStateObserver);
   }
@@ skipping 540 matching lines @@
   if (aura::Env::GetInstance()) {
     aura::Env::GetInstance()->set_context_factory(GetContextFactory());
   }
 #endif
 #elif defined(OS_ANDROID)
   // TODO(crbug.com/439322): This should be set to |true|.
   established_gpu_channel = false;
   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
 #endif
 
+  {
+    TRACE_EVENT0("startup", "BrowserThreadsStarted::Subsystem:AudioMan");
+    audio_manager_.reset(media::AudioManager::CreateWithHangTimer(
+        MediaInternals::GetInstance(), io_thread_->task_runner()));
+  }
+
+  {
+    TRACE_EVENT0("startup", "BrowserThreadsStarted::Subsystem:MidiManager");
+    midi_manager_.reset(media::MidiManager::Create());
+  }
+
 #if defined(OS_LINUX) && defined(USE_UDEV)
   device_monitor_linux_.reset(new DeviceMonitorLinux());
 #elif defined(OS_MACOSX)
   device_monitor_mac_.reset(new DeviceMonitorMac());
 #endif
 
 #if defined(OS_WIN)
   UMA_HISTOGRAM_BOOLEAN("Windows.Win32kRendererLockdown",
                         IsWin32kRendererLockdownEnabled());
 #endif
@@ skipping 176 matching lines @@
 
 void BrowserMainLoop::EndStartupTracing() {
   is_tracing_startup_ = false;
   TracingController::GetInstance()->DisableRecording(
       TracingController::CreateFileSink(
           startup_trace_file_,
           base::Bind(OnStoppedStartupTracing, startup_trace_file_)));
 }
 
 }  // namespace content