Valgrind: Add action to load external log file

...for the memcheck and callgrind tool.

Task-number: QTCREATORBUG-10057

Change-Id: I23dd3ad47f0498af37787bf54e76b09852cb327c
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/valgrind/callgrindtool.h

@@ -53,6 +53,7 @@ public:
     QWidget *createWidgets();
 
     void startTool(Analyzer::StartMode mode);
+    void loadExternalXmlLogFile();
 
 public slots:
     void handleShowCostsOfFunction();