Add initial dependencies on the w3c test repos (no tests yet).

This change pulls in the w3c's test repos so that we can start running
the tests in Blink. The initial change just pulls in versions that
are empty, so we will clone the repos but not actually run any tests;
this can be used for local testing and development and is a minor
incremental step as the process for importing tests is worked out and
polished. A subsequent change will start pulling in revisions
with selected subdirectories populated.

R=ojan@chromium.org, abarth@chromium.org
BUG=242329

Review URL: https://codereview.chromium.org/107503004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242145 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242146 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242146