Bug 1166469 - Add HandleBackendError for hfp-fallback product, r=btian

dom/bluetooth/bluedroid/hfp-fallback/BluetoothHfpManager.cpp

@@ -201,6 +201,17 @@ BluetoothHfpManager::ConnectSco()
   return false;
 }
 
+void
+BluetoothHfpManager::HandleBackendError()
+{
+  /**
+   * TODO: 
+   *   Reset connection state and audio state to DISCONNECTED to handle backend
+   *   error. The state change triggers UI status bar update as ordinary
+   *   bluetooth turn-off sequence.
+   */
+}
+
 bool
 BluetoothHfpManager::DisconnectSco()
 {

dom/bluetooth/bluedroid/hfp-fallback/BluetoothHfpManager.h

@@ -34,6 +34,8 @@ public:
 
   bool ConnectSco();
   bool DisconnectSco();
+  // Handle unexpected backend crash
+  void HandleBackendError();
 
 protected:
   virtual ~BluetoothHfpManager() { }