Add stuff that are generated from tests.

Technically, all of these should be generated in /tmp but let's punt that for
now.

TBR=petermayo@chromium.org
BUG=


Review URL: https://chromiumcodereview.appspot.com/10915093

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@154965 0039d316-1c4b-4281-b951-d872f2087c98

.gitignore

@@ -26,6 +26,9 @@
 
 # Ignore unittest related files.
 /testing_support/_rietveld
+/tests/git-svn-submodule/
 /tests/subversion_config/README.txt
 /tests/subversion_config/auth
 /tests/subversion_config/servers
+/tests/svn/
+/tests/svnrepo/