Added Object::resizeGLObjectBuffers(uint) method to help improve the ability

to change the number of active graphics contexts on the fly during an applications
life.

include/osg/Program

@@ -63,6 +63,9 @@ class OSG_EXPORT Program : public osg::StateAttribute
 
         virtual void compileGLObjects(osg::State& state) const;
 
+        /** Resize any per context GLObject buffers to specified size. */
+        virtual void resizeGLObjectBuffers(unsigned int maxSize);
+
         /** release OpenGL objects in specified graphics context if State
             object is passed, otherwise release OpenGL objects for all graphics context if
             State object pointer NULL.*/