Mojo interfaces needed for switching audio rendering stream creation and closing from IPC to Mojo

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index 08b8b0b3756fc55302e80b7f8df2d3f071f2123a..6fa09bf8f1395e7af24735d0c32e614938954314 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -29,11 +29,11 @@
 #include "content/common/storage_partition_service.mojom.h"
 #include "content/public/renderer/render_thread.h"
 #include "content/renderer/gpu/compositor_dependencies.h"
+#include "content/renderer/media/audio_output_client.h"
 #include "gpu/ipc/client/gpu_channel_host.h"
 #include "net/base/network_change_notifier.h"
 #include "third_party/WebKit/public/platform/WebConnectionType.h"
 #include "ui/gfx/native_widget_types.h"
-
 #if defined(OS_MACOSX)
 #include "third_party/WebKit/public/web/mac/WebScrollbarTheme.h"
 #endif
@@ -520,7 +520,6 @@ class CONTENT_EXPORT RenderThreadImpl
   bool RendererIsHidden() const;
   void OnRendererHidden();
   void OnRendererVisible();
-
   void ReleaseFreeMemory();
 
   // These objects live solely on the render thread.
@@ -564,6 +563,8 @@ class CONTENT_EXPORT RenderThreadImpl
   // Used on the render thread.
   std::unique_ptr<VideoCaptureImplManager> vc_manager_;
 
+  AudioOutputClient* audio_output_client_;
+
   // Used for communicating registering AEC dump consumers with the browser and
   // receving AEC dump file handles when AEC dump is enabled. An AEC dump is
   // diagnostic audio data for WebRTC stored locally when enabled by the user in