initialize qtwebengine's chromium submodule after cloning it

Change-Id: I7e3ef09eb437f700c6fe010ce44a711118e8bd75
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>
Build Wayland on Linux (except Android)

Change-Id: Ief1276f88837885637d0e60c90c4713bd12f6c85
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Robin Burchell <robin.burchell@viroteck.net>
Let init-repository build the mirror URL from the original URL

This allows repositories that have a different submodule name than their
URL file part to be using the mirror.

i.e. qtwebengine's src/3rdparty mapped to .../qt/qtwebengine-chromium.git

Change-Id: Ibea9cb9db701c95fc6f8b0e2457de74823aeeba5
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
init-repository: Make sure that we update a submodule before we recurse

Unless we do so, doing git submodule init in a submodule would use the
currently checked out version of its .gitmodule instead of the one of
its pinned SHA1.

Change-Id: I88de421c8d24748dcaa5334c82da2aac4b12b2ad
Reviewed-by: Andras Becsi <andras.becsi@digia.com>
init-repository: Support submodules more than one dir deep

Change-Id: I8783ded72032dda42bc24a855e190e0a2e699b01
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>
Add QtWebChannel as optional dependency of QtWebKit.

This is required to prepare the merge of the integration patch.
The QtWebChannel and QtWebSockets lines in qt.pro are moved such
that they occur before their first use in QtWebKit.

Change-Id: Ie8137da57827776fe7b1434538df6b08108b0349
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>