Debugger: Let the DebuggerRunTool optionally handle the PortsGatherer

Less code in the target implementations.

Change-Id: I759f082eba5eab7f4e8252c0d7b5ec64059ba860
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/debugger/debuggerruncontrol.h

@@ -39,6 +39,8 @@ class TerminalRunner;
 class DebuggerRunToolPrivate;
 } // Internal
 
+class GdbServerPortsGatherer;
+
 class DEBUGGER_EXPORT DebuggerRunTool : public ProjectExplorer::RunWorker
 {
     Q_OBJECT
@@ -71,6 +73,9 @@ public:
     bool isQmlDebugging() const;
     int portsUsedByDebugger() const;
 
+    void setUsePortsGatherer(bool useCpp, bool useQml);
+    GdbServerPortsGatherer *portsGatherer() const;
+
     void setSolibSearchPath(const QStringList &list);
     void addSolibSearchDir(const QString &str);