RFR: JDK-8204303: Add redirect for overview-summary.html

[Hannes Wallnöfer]

Hi Jon,

Looks good to me. 

Hannes

> Am 05.06.2018 um 19:16 schrieb Jonathan Gibbons <jonathan.gibbons at oracle.com>:
> 
> The recent change to update javadoc to not generate frames by default means that the overview-summary.html file is no longer generated: the content that was previously in that file is now in the top-level index.html file.
> 
> This means that any saved bookmarks to the overview-summary.html file are invalid.
> 
> The fix is to generate a dummy overview-summary.html that simply redirects to the top-level index.html file. The file is only generated when it would otherwise have been generated in frames mode. The file may eventually be removed in an unspecified future release, after suitable explicit warnings have been made.
> 
> The change leverages the existing code in IndexRedirectWriter.java, by generalizing it to create redirect files from any file to any other file in the doc bundle.
> 
> JBS: https://bugs.openjdk.java.net/browse/JDK-8204303
> Webrev: http://cr.openjdk.java.net/~jjg/8204303/webrev.00/index.html
> 
> -- Jon
>