https://bugs.webkit.org/show_bug.cgi?id=112419

Patch by Manuel Rego Casasnovas <rego@igalia.com> on 2013-04-04
Reviewed by Carlos Garcia Campos.

Add support for about URIs in MiniBrowser. An example about page is show
with URI "about:minibrowser", the rest of the cases it will show a
proper message explaining that the about page didn't exist.

Internally it uses "minibrowser-about" prefix instead of "about", but
from the user point of view it works with "about" prefix.

* MiniBrowser/gtk/BrowserWindow.c: Add miniBrowserAboutScheme constant.
(getInternalURI): Method to convert URIs from "about" prefix to
"minibrowser-about".
(getExternalURI): Opposite method.
(webViewURIChanged): Use "about" prefix to show the URI to users.
(webViewEnterFullScreen): Ditto.
(browser_window_load_uri): Use "minibrowser-about" prefix internally.
* MiniBrowser/gtk/main.c: Add miniBrowserAboutScheme constant.
(aboutURISchemeRequestCallback): Callback to manage about calls.
(main): Register the URI scheme to manage about URIs.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147624 268f45cc-cd09-0410-ab3c-d52691b4dbfc