Add AudioStreamRegistry. Move stream counting logic

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index 5023fbf8fa0b7b6c176b482cbe55a027eba47dae..e7fb93452933fb6ba22165d768f62aa1dcd2b6e1 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -103,6 +103,7 @@
 #include "content/browser/renderer_host/file_utilities_message_filter.h"
 #include "content/browser/renderer_host/media/audio_input_renderer_host.h"
 #include "content/browser/renderer_host/media/audio_renderer_host.h"
+#include "content/browser/renderer_host/media/audio_stream_registry_impl.h"
 #include "content/browser/renderer_host/media/media_stream_dispatcher_host.h"
 #include "content/browser/renderer_host/media/peer_connection_tracker_host.h"
 #include "content/browser/renderer_host/media/video_capture_host.h"
@@ -680,6 +681,7 @@ RenderProcessHostImpl::RenderProcessHostImpl(
       gpu_observer_registered_(false),
       delayed_cleanup_needed_(false),
       within_process_died_observer_(false),
+      audio_stream_registry_(AudioStreamRegistryImpl::Create(id_)),
 #if BUILDFLAG(ENABLE_WEBRTC)
       webrtc_eventlog_host_(id_),
 #endif
@@ -1077,8 +1079,8 @@ void RenderProcessHostImpl::CreateMessageFilters() {
       BrowserMainLoop::GetInstance()->user_input_monitor());
   AddFilter(audio_input_renderer_host_.get());
   audio_renderer_host_ = new AudioRendererHost(
-      GetID(), audio_manager, AudioMirroringManager::GetInstance(),
-      media_stream_manager,
+      GetID(), audio_stream_registry_.get(), audio_manager,
+      AudioMirroringManager::GetInstance(), media_stream_manager,
       browser_context->GetResourceContext()->GetMediaDeviceIDSalt());
   AddFilter(audio_renderer_host_.get());
   AddFilter(
@@ -2277,6 +2279,15 @@ void RenderProcessHostImpl::EnableAudioDebugRecordings(
         base::Bind(&AudioInputRendererHost::EnableDebugRecording,
                    audio_input_renderer_host_, file));
   }
+
+  // |audio_stream_registry_| is deleted on the IO thread and if |this| is
+  // alive now it means that the task to delete |audio_stream_registry_|
+  // isn't posted, so this task is scheduled before any task to delete
+  // |audio_stream_registry_.get()|.
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(&AudioStreamRegistryImpl::EnableDebugRecording,
+                 base::Unretained(audio_stream_registry_.get()), file));
 }
 
 void RenderProcessHostImpl::DisableAudioDebugRecordings() {
@@ -2793,7 +2804,7 @@ void RenderProcessHostImpl::UpdateProcessPriority() {
   // visible widgets -- the callers must call this function whenever we
   // transition in/out of those states.
   const bool should_background =
-      visible_widgets_ == 0 && !audio_renderer_host_->HasActiveAudio() &&
+      visible_widgets_ == 0 && !audio_stream_registry_->HasActiveAudio() &&
       !base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kDisableRendererBackgrounding);