Chromium is not using a regular git submodule based
repository layout. Therefore some special tweaking is
necessary.
This script will take care of setting the correct
submodule paths and references after cloning the
qtwebengine repository.
Further it also downloads and builds the ninja build tool.

Change-Id: I999ef33cbdbe3bfaff88253bb543ba77f5b68fd7
Reviewed-by: Pierre Rossi <pierre.rossi@gmail.com>
Reviewed-by: Andras Becsi <andras.becsi@digia.com>