For the asynchronous loading we need a function call that parses a file, given its path, and retrieves the image width and height. This commit adds cogl_bitmap_get_size_from_file() to the CoglBitmap API.
svn merge \ https://svn.o-hand.com/repos/clutter/trunk/clutter@2509 \ https://svn.o-hand.com/repos/clutter/branches/clutter-ivan@HEAD