Bug 1239979: Add |BluetoothSocket::Accept| method, r=btian

The new method |Accept| of |BluetoothSocket| encapsulates the code
for accepting from a passive socket. Having this method will allow
for storing the socket interface in |BluetoothSocket| itself.

dom/bluetooth/bluedroid/BluetoothSocket.cpp

@@ -429,24 +429,20 @@ private:
 class InvokeAcceptTask final : public SocketTask<DroidSocketImpl>
 {
 public:
-  InvokeAcceptTask(DroidSocketImpl* aImpl, int aFd)
+  InvokeAcceptTask(DroidSocketImpl* aImpl, int aListenFd)
     : SocketTask<DroidSocketImpl>(aImpl)
-    , mFd(aFd)
+    , mListenFd(aListenFd)
   { }
 
   void Run() override
   {
     MOZ_ASSERT(GetIO()->IsConsumerThread());
-    MOZ_ASSERT(sBluetoothSocketInterface);
 
-    BluetoothSocketResultHandler* res = new AcceptResultHandler(GetIO());
+    GetIO()->mConsumer->Accept(mListenFd, new AcceptResultHandler(GetIO()));
-    GetIO()->mConsumer->SetCurrentResultHandler(res);
-
-    sBluetoothSocketInterface->Accept(mFd, res);
   }
 
 private:
-  int mFd;
+  int mListenFd;
 };
 
 void
@@ -751,6 +747,15 @@ BluetoothSocket::Listen(const nsAString& aServiceName,
                 MessageLoop::current(), XRE_GetIOMessageLoop());
 }
 
+nsresult
+BluetoothSocket::Accept(int aListenFd, BluetoothSocketResultHandler* aRes)
+{
+  SetCurrentResultHandler(aRes);
+  sBluetoothSocketInterface->Accept(aListenFd, aRes);
+
+  return NS_OK;
+}
+
 void
 BluetoothSocket::ReceiveSocketData(nsAutoPtr<UnixSocketBuffer>& aBuffer)
 {

dom/bluetooth/bluedroid/BluetoothSocket.h

@@ -52,6 +52,8 @@ public:
                   int aChannel,
                   bool aAuth, bool aEncrypt);
 
+  nsresult Accept(int aListenFd, BluetoothSocketResultHandler* aRes);
+
   /**
    * Method to be called whenever data is received. This is only called on the
    * consumer thread.
@@ -70,11 +72,6 @@ public:
     mDeviceAddress = aDeviceAddress;
   }
 
-  inline void SetCurrentResultHandler(BluetoothSocketResultHandler* aRes)
-  {
-    mCurrentRes = aRes;
-  }
-
   // Methods for |DataSocket|
   //
 
@@ -90,6 +87,11 @@ public:
   void OnDisconnect() override;
 
 private:
+  inline void SetCurrentResultHandler(BluetoothSocketResultHandler* aRes)
+  {
+    mCurrentRes = aRes;
+  }
+
   BluetoothSocketObserver* mObserver;
   BluetoothSocketResultHandler* mCurrentRes;
   DroidSocketImpl* mImpl;