Host-side implementation of ARC audio bridge.

components/arc/arc_bridge_service.h

Index: components/arc/arc_bridge_service.h
diff --git a/components/arc/arc_bridge_service.h b/components/arc/arc_bridge_service.h
index fac652310d820e4cd979fae6694e7883f72626bb..99ad11778d52b05abdd70ac05fe22cdda85a5594 100644
--- a/components/arc/arc_bridge_service.h
+++ b/components/arc/arc_bridge_service.h
@@ -77,6 +77,10 @@ class ArcBridgeService : public ArcBridgeHost {
     virtual void OnAppInstanceReady() {}
     virtual void OnAppInstanceClosed() {}
 
+    // Called whenever the ARC audio interface state changes.
+    virtual void OnAudioInstanceReady() {}
+    virtual void OnAudioInstanceClosed() {}
+
     // Called whenever the ARC auth interface state changes.
     virtual void OnAuthInstanceReady() {}
     virtual void OnAuthInstanceClosed() {}
@@ -155,6 +159,7 @@ class ArcBridgeService : public ArcBridgeHost {
   // you want to be notified when this is ready. This can only be called on the
   // thread that this class was created on.
   AppInstance* app_instance() { return app_ptr_.get(); }
+  AudioInstance* audio_instance() { return audio_ptr_.get(); }
   AuthInstance* auth_instance() { return auth_ptr_.get(); }
   ClipboardInstance* clipboard_instance() { return clipboard_ptr_.get(); }
   ImeInstance* ime_instance() { return ime_ptr_.get(); }
@@ -171,6 +176,7 @@ class ArcBridgeService : public ArcBridgeHost {
   VideoInstance* video_instance() { return video_ptr_.get(); }
 
   int32_t app_version() const { return app_ptr_.version(); }
+  int32_t audio_version() const { return audio_ptr_.version(); }
   int32_t auth_version() const { return auth_ptr_.version(); }
   int32_t clipboard_version() const { return clipboard_ptr_.version(); }
   int32_t ime_version() const { return ime_ptr_.version(); }
@@ -184,6 +190,7 @@ class ArcBridgeService : public ArcBridgeHost {
 
   // ArcHost:
   void OnAppInstanceReady(AppInstancePtr app_ptr) override;
+  void OnAudioInstanceReady(AudioInstancePtr audio_ptr) override;
   void OnAuthInstanceReady(AuthInstancePtr auth_ptr) override;
   void OnClipboardInstanceReady(ClipboardInstancePtr clipboard_ptr) override;
   void OnImeInstanceReady(ImeInstancePtr ime_ptr) override;
@@ -229,6 +236,7 @@ class ArcBridgeService : public ArcBridgeHost {
 
   // Called when one of the individual channels is closed.
   void CloseAppChannel();
+  void CloseAudioChannel();
   void CloseAuthChannel();
   void CloseClipboardChannel();
   void CloseImeChannel();
@@ -242,6 +250,7 @@ class ArcBridgeService : public ArcBridgeHost {
 
   // Callbacks for QueryVersion.
   void OnAppVersionReady(int32_t version);
+  void OnAudioVersionReady(int32_t version);
   void OnAuthVersionReady(int32_t version);
   void OnClipboardVersionReady(int32_t version);
   void OnImeVersionReady(int32_t version);
@@ -255,6 +264,7 @@ class ArcBridgeService : public ArcBridgeHost {
 
   // Mojo interfaces.
   AppInstancePtr app_ptr_;
+  AudioInstancePtr audio_ptr_;
   AuthInstancePtr auth_ptr_;
   ClipboardInstancePtr clipboard_ptr_;
   ImeInstancePtr ime_ptr_;
@@ -273,6 +283,7 @@ class ArcBridgeService : public ArcBridgeHost {
   // To keep the xxx_instance() functions being trivial, store the instance
   // pointer in a temporary variable to avoid losing its reference.
   AppInstancePtr temporary_app_ptr_;
+  AudioInstancePtr temporary_audio_ptr_;
   AuthInstancePtr temporary_auth_ptr_;
   ClipboardInstancePtr temporary_clipboard_ptr_;
   ImeInstancePtr temporary_ime_ptr_;