Strip out stream counting from AudioRendererHost.

content/browser/renderer_host/render_process_host_impl.h

 // 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_PROCESS_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_PROCESS_HOST_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 105 matching lines @@
   void EnableSendQueue() override;
   int GetNextRoutingID() override;
   void AddRoute(int32_t routing_id, IPC::Listener* listener) override;
   void RemoveRoute(int32_t routing_id) override;
   void AddObserver(RenderProcessHostObserver* observer) override;
   void RemoveObserver(RenderProcessHostObserver* observer) override;
   void ShutdownForBadMessage(CrashReportMode crash_report_mode) override;
   void WidgetRestored() override;
   void WidgetHidden() override;
   int VisibleWidgetCount() const override;
-  void AudioStateChanged() override;
   bool IsForGuestsOnly() const override;
   StoragePartition* GetStoragePartition() const override;
   bool Shutdown(int exit_code, bool wait) override;
   bool FastShutdownIfPossible() override;
   base::ProcessHandle GetHandle() const override;
   bool IsReady() const override;
   BrowserContext* GetBrowserContext() const override;
   bool InSameStoragePartition(StoragePartition* partition) const override;
   int GetID() const override;
   bool HasConnection() const override;
@@ skipping 143 matching lines @@
   void GetAudioOutputControllers(
       const GetAudioOutputControllersCallback& callback) const override;
 
 #if defined(OS_POSIX) && !defined(OS_ANDROID) && !defined(OS_MACOSX)
   // Launch the zygote early in the browser startup.
   static void EarlyZygoteLaunch();
 #endif  // defined(OS_POSIX) && !defined(OS_ANDROID) && !defined(OS_MACOSX)
 
   void RecomputeAndUpdateWebKitPreferences();
 
+  // Called when an audio stream is added or removed and used to determine if
+  // the process should be backgrounded or not.
+  void OnAudioStreamAdded() override;
+  void OnAudioStreamRemoved() override;
+  int get_audio_stream_count_for_testing() const { return audio_stream_count_; }
+
  protected:
   // A proxy for our IPC::Channel that lives on the IO thread.
   std::unique_ptr<IPC::ChannelProxy> channel_;
 
   // True if fast shutdown has been performed on this RPH.
   bool fast_shutdown_started_;
 
   // True if we've posted a DeleteTask and will be deleted soon.
   bool deleting_soon_;
 
@@ skipping 292 matching lines @@
 
   scoped_refptr<ResourceMessageFilter> resource_message_filter_;
   std::unique_ptr<GpuClient, BrowserThread::DeleteOnIOThread> gpu_client_;
 
   std::unique_ptr<OffscreenCanvasCompositorFrameSinkProviderImpl>
       offscreen_canvas_provider_;
 
   mojom::RouteProviderAssociatedPtr remote_route_provider_;
   mojom::RendererAssociatedPtr renderer_interface_;
 
+  // Tracks active audio streams within the render process; used to determine if
+  // if a process should be backgrounded.
+  int audio_stream_count_ = 0;
+
   // A WeakPtrFactory which is reset every time Cleanup() runs. Used to vend
   // WeakPtrs which are invalidated any time the RPHI is recycled.
   std::unique_ptr<base::WeakPtrFactory<RenderProcessHostImpl>>
       instance_weak_factory_;
 
   base::WeakPtrFactory<RenderProcessHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderProcessHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_PROCESS_HOST_IMPL_H_