Symbian: backgroundtexture should be shared across applications

Currently backgroundTexture needs to be generated for every app launch.It is rendered offscreen by AknSkinServer and result is converted to QPixmap. Approx time taken by this function is 80 msec and 90% of the time seems to be spent in conversion of cfbsbitmap to qpixmap.

It would be beneficial if we could save the pixmap data(i.e into a file??) and share it across applications