Bug 1239442 - Update common.tests.zip to contain dom/media/test/external-media-sites. r=gps

--HG--
extra : transplant_source : %A9V%D1%7B%0F%92A%CAg%C6%A6%84Xe%0B%2B%94%B4%C2l

python/mozbuild/mozbuild/action/test_archive.py

@@ -57,6 +57,11 @@ ARCHIVE_FILES = {
             'base': 'testing',
             'pattern': 'firefox-ui/**',
         },
+        {
+            'source': buildconfig.topsrcdir,
+            'base': 'dom/media/test',
+            'pattern': 'external-media-tests/**',
+        },
         {
             'source': buildconfig.topsrcdir,
             'base': 'js/src',