Bug 1560312 - Run fission tests without WR as well. r=botond

This also disables the test on Windows 7 because the newly enabled subtests
fail intermittently there. We don't care so much about Windows 7 these days,
and I don't have a local setup to reproduce it, so I didn't investigate the
failure.

Differential Revision: https://phabricator.services.mozilla.com/D37819

--HG--
extra : moz-landing-system : lando

gfx/layers/apz/test/mochitest/browser.ini

@@ -1,4 +1,5 @@
 [browser_test_group_fission.js]
+skip-if = os == 'win' && bits == 32     # Some subtests fail intermittently on Win7
 support-files =
   apz_test_native_event_utils.js
   apz_test_utils.js

gfx/layers/apz/test/mochitest/browser_test_group_fission.js

@@ -14,12 +14,12 @@ add_task(async function test_main() {
   // is fission-enabled.
   var test_urls = [
     httpURL("helper_fission_basic.html"),
+    httpURL("helper_fission_transforms.html"),
+    httpURL("helper_fission_scroll_oopif.html"),
     // add additional tests here
   ];
   if (isWebRender) {
     test_urls = test_urls.concat([
-      httpURL("helper_fission_transforms.html"),
-      httpURL("helper_fission_scroll_oopif.html"),
       // add additional WebRender-specific tests here
     ]);
   }