Debugger: Populate "Source Files" for QML, showing shadow .js structure

Request the sources actually seen by v8, and show them in a separate file
(click on the leftmost column). Automatically populating 'Source Files'
and also making the functionality available for mixed debugging requires
some more thought ...

Change-Id: Id8f55eed9c842b545434a6c608fb34d370a8f8bb
Reviewed-by: Aurindam Jana <aurindam.jana@nokia.com>

src/plugins/debugger/qml/qmlengine.h

@@ -68,12 +68,17 @@ public:
 
     void showMessage(const QString &msg, int channel = LogDebug,
                      int timeout = -1) const;
+    void gotoLocation(const Internal::Location &location);
+
     void filterApplicationMessage(const QString &msg, int channel);
     QString toFileInProject(const QUrl &fileUrl);
     void inferiorSpontaneousStop();
 
     void logMessage(const QString &service, LogDirection direction, const QString &str);
 
+    void setSourceFiles(const QStringList &fileNames);
+    void updateScriptSource(const QString &fileName, int lineOffset, int columnOffset, const QString &source);
+
     QmlAdapter *adapter() const;
 
 public slots:
@@ -120,12 +125,14 @@ private:
 
     void assignValueInDebugger(const WatchData *data,
         const QString &expr, const QVariant &value);
+
+
     void loadSymbols(const QString &moduleName);
     void loadAllSymbols();
     void requestModuleSymbols(const QString &moduleName);
     void reloadModules();
     void reloadRegisters() {}
-    void reloadSourceFiles() {}
+    void reloadSourceFiles();
     void reloadFullStack() {}
 
     bool supportsThreads() const { return false; }