Add update-chromium target and unify 'Update Chromium' commits

To save some typing when doing 3rdparty udpate introduce
'update-chromium' target, which creates commit with nicely
formated commit message with shas, it can be used for example
with following steps:

* qtwebengine repo is at the origin HEAD with nothing stagged
* there are some new commits in 3rdparty
* code compiles and there are no issues
* make update commit by typing in <build_dir>
    * ninja update-chromium
    or
    * cmake --build . --target update-chromium
* push the commit

You can also create the commit from <source_dir> with:
   cmake -P cmake/SubmoduleUpdate.cmake

Pick-to: 6.5
Change-Id: Ia6b051cd2df0646707c2cc88175245841728794f
Reviewed-by: Michal Klocek <michal.klocek@qt.io>
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
Reviewed-by: Yigit Akcay <yigit.akcay@qt.io>

0 files changed, 0 insertions, 0 deletions