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 408da27deca9ce2080790b73700052b8aa8e99ab..ba3e34fe03096b3251a39a528bcb127185ab8334 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -9,8 +9,7 @@
 
 #include <algorithm>
 #include <limits>
-#include <utility>
-#include <vector>
+#include <set>
 
 #include "base/base_switches.h"
 #include "base/bind.h"
@@ -103,6 +102,7 @@
 #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"
@@ -679,6 +679,7 @@ 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
@@ -1076,8 +1077,8 @@ 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(
@@ -2790,7 +2791,7 @@ 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);