analyzer: add 'redo' to callgrind result navigation

Change-Id: Ic7b348fc8df57f8a4d7a361d67b2c183ef7f1a46
Reviewed-on: http://codereview.qt.nokia.com/523
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/valgrind/callgrindengine.h

@@ -53,8 +53,10 @@ public:
 
     Valgrind::Callgrind::ParseData *takeParserData();
 
+    bool canPause() const { return true; }
+
 public slots:
-    // controller actions
+    /// controller actions
     void dump();
     void reset();
     void pause();