Implementing AudioOutputDevice authorization timeout

content/renderer/media/audio_device_factory.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/media/audio_device_factory.h"
 
+#include <algorithm>
+
 #include "base/logging.h"
+#include "content/common/content_constants_internal.h"
 #include "content/renderer/media/audio_input_message_filter.h"
 #include "content/renderer/media/audio_message_filter.h"
 #include "content/renderer/media/audio_renderer_mixer_manager.h"
 #include "content/renderer/render_thread_impl.h"
 #include "media/audio/audio_input_device.h"
 #include "media/audio/audio_output_device.h"
 #include "media/base/audio_renderer_mixer_input.h"
 #include "url/origin.h"
 
 namespace content {
 
 // static
 AudioDeviceFactory* AudioDeviceFactory::factory_ = NULL;
 
 namespace {
+const int64_t kMaxAuthorizationTimeout = 4000;
 
 scoped_refptr<media::AudioOutputDevice> NewOutputDevice(
     int render_frame_id,
     int session_id,
     const std::string& device_id,
     const url::Origin& security_origin) {
   AudioMessageFilter* const filter = AudioMessageFilter::Get();
   scoped_refptr<media::AudioOutputDevice> device(new media::AudioOutputDevice(
       filter->CreateAudioOutputIPC(render_frame_id), filter->io_task_runner(),
-      session_id, device_id, security_origin));
+      session_id, device_id, security_origin,
+      base::TimeDelta::FromMilliseconds(
+          std::min(kHungRendererDelayMs * 8 / 10, kMaxAuthorizationTimeout))));

[DaleCurtis, 2016/06/13 18:30:09]

Needs explanation. 

[o1ka, 2016/06/14 10:33:05]

Done.

   device->RequestDeviceAuthorization();
   return device;
 }
 
 // This is where we decide which audio will go to mixers and which one to
 // AudioOutpuDevice directly.
 bool IsMixable(AudioDeviceFactory::SourceType source_type) {
   if (source_type == AudioDeviceFactory::kSourceMediaElement)
     return true;  // Must ALWAYS go through mixer.
 
@@ skipping 126 matching lines @@
                                                device_id, security_origin);
     if (sink)
       return sink;
   }
 
   return NewOutputDevice(render_frame_id, session_id, device_id,
                          security_origin);
 }
 
 }  // namespace content