Caching AudioOutputDevice instances in mixer manager

content/renderer/render_thread_impl.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/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <utility>
@@ skipping 1481 matching lines @@
 }
 
 bool RenderThreadImpl::EnableStreamTextureCopy() {
   return sync_compositor_message_filter_.get();
 }
 
 #endif
 
 AudioRendererMixerManager* RenderThreadImpl::GetAudioRendererMixerManager() {
   if (!audio_renderer_mixer_manager_) {
-    audio_renderer_mixer_manager_.reset(new AudioRendererMixerManager());
+    audio_renderer_mixer_manager_.reset(
+        AudioRendererMixerManager::Create().release());
   }
 
   return audio_renderer_mixer_manager_.get();
 }
 
 media::AudioHardwareConfig* RenderThreadImpl::GetAudioHardwareConfig() {
   if (!audio_hardware_config_) {
     media::AudioParameters input_params;
     media::AudioParameters output_params;
     Send(new ViewHostMsg_GetAudioHardwareConfig(
@@ skipping 570 matching lines @@
       v8_memory_pressure_level == v8::MemoryPressureLevel::kCritical)
     v8_memory_pressure_level = v8::MemoryPressureLevel::kModerate;
 
   blink::mainThreadIsolate()->MemoryPressureNotification(
       v8_memory_pressure_level);
   blink::MemoryPressureNotificationToWorkerThreadIsolates(
       v8_memory_pressure_level);
 }
 
 }  // namespace content