Introduce new osgViewer::Renderer class for implementing of the rendering

of cameras in viewers

include/osg/GraphicsThread

@@ -106,6 +106,17 @@ struct OSG_EXPORT FlushDeletedGLObjectsOperation : public GraphicsOperation
     double _availableTime;
 };
 
+class OSG_EXPORT RunOperations : public osg::GraphicsOperation
+{
+public:
+
+    RunOperations():
+        osg::GraphicsOperation("RunOperation",true) {}
+    
+    virtual void operator () (osg::GraphicsContext* context);
+    
+};
+
 }
 
 #endif