This is what's left out in the patch for bug 23340 (I should have made certain that this was landed as a part of the patch, but due to a 'bad timing', this piece missed the train).
This patch is for non-BMP characters in Chromium-Win.
Created attachment 27125 [details]
Recap from ChangeLog (FYI):
This comes from Chromium patch (http://codereview.chromium.org/17624).
Add m_disableFontFallback to UniscriberHelper class and set it
to true when filling up glyph pages for non-BMP code points.
When it's set true, UniscriberHelper does not do its own font
fallback. Neither does it do glyph placement. Font fallback
will be taken care of in the simple script font path and glyph
placement is not necessary for simple scripts.
Layout test is missing at the moment due to the lack of freely
distributable font covering a non-BMP code page. A test page
is available at http://i18nl10n.com/webkit/nonbmp2.html
As for the layout test, I plan to make a simple TTF with 'ugly' glyphs covering a small number of non-BMP characters.
Comment on attachment 27125 [details]
This looks fine. I'll land after fixing the spacing on one indent.
Sigh. It looks like this patch file was modified after it was created. :( That's bad, cause it means it won't apply. I fixed up the ChangeLog section of the patch to apply, looks like a line was removed from the ChangeLog portion of the patchfile instead of removing the line first from the ChangeLog and regenerating the patch file.
Committing to http://svn.webkit.org/repository/webkit/trunk ...