Implement ProcessLauncher::processId()

Implement the reply confirmation for the started signal.
After qtcreator_processlauncher starts a new process
we connect to its started() signal and post a reply through
the socket to the LauncherInterface with the information about
the new PID. ProcessLauncherImpl now emits the started signal
with a delay, just after the confirmation has been received.

Change-Id: I2689e8e97b17466bd1f6b32c01909c12d80fcdef
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/launcherpackets.cpp

@@ -67,6 +67,22 @@ void StartProcessPacket::doDeserialize(QDataStream &stream)
 }
 
 
+ProcessStartedPacket::ProcessStartedPacket(quintptr token)
+    : LauncherPacket(LauncherPacketType::ProcessStarted, token)
+{
+}
+
+void ProcessStartedPacket::doSerialize(QDataStream &stream) const
+{
+    stream << processId;
+}
+
+void ProcessStartedPacket::doDeserialize(QDataStream &stream)
+{
+    stream >> processId;
+}
+
+
 StopProcessPacket::StopProcessPacket(quintptr token)
     : LauncherPacket(LauncherPacketType::StopProcess, token)
 {