Switch stream creation and closing in Chrome audio rendering from IPC to Mojo

content/browser/frame_host/render_frame_host_impl.h

Index: content/browser/frame_host/render_frame_host_impl.h
diff --git a/content/browser/frame_host/render_frame_host_impl.h b/content/browser/frame_host/render_frame_host_impl.h
index 45d8ca0cffc75a6862df86dcbaef4b24a71fe007..dd0321f6922995074c4187358b39d355b990eb31 100644
--- a/content/browser/frame_host/render_frame_host_impl.h
+++ b/content/browser/frame_host/render_frame_host_impl.h
@@ -24,6 +24,7 @@
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/bad_message.h"
 #include "content/browser/loader/global_routing_id.h"
+#include "content/browser/media/audio_output_impl.h"
 #include "content/browser/site_instance_impl.h"
 #include "content/browser/webui/web_ui_impl.h"
 #include "content/common/accessibility_mode_enums.h"
@@ -70,7 +71,7 @@ class WebBluetoothService;
 }
 
 namespace content {
-
+class AudioOutputImpl;
 class CrossProcessFrameConnector;
 class CrossSiteTransferringRequest;
 class FrameMojoShell;
@@ -115,6 +116,10 @@ class CONTENT_EXPORT RenderFrameHostImpl : public RenderFrameHost,
   ~RenderFrameHostImpl() override;
 
   // RenderFrameHost
+  AudioOutputImpl* GetAudioOutputImpl() override;
+
+  void SetAudioOutputImpl(AudioOutputImpl* audio_output_impl) override;
+
   int GetRoutingID() override;
   AXTreeIDRegistry::AXTreeID GetAXTreeID() override;
   SiteInstanceImpl* GetSiteInstance() override;
@@ -756,6 +761,8 @@ class CONTENT_EXPORT RenderFrameHostImpl : public RenderFrameHost,
   // happen before it fires (to avoid flakiness).
   void DisableSwapOutTimerForTesting();
 
+  AudioOutputImpl* audio_output_impl_;
+
   // For now, RenderFrameHosts indirectly keep RenderViewHosts alive via a
   // refcount that calls Shutdown when it reaches zero.  This allows each
   // RenderFrameHostManager to just care about RenderFrameHosts, while ensuring