Improvements to tab-stress

Add about:blank variant of tab-stress
Add query for total renderers created during the test.

Change-Id: I5b6187d2db47ef29dab8fe156d02d959a39c7790
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/web-tests/+/6450818
Reviewed-by: Chinglin Yu <chinglinyu@chromium.org>
24 files changed
tree: 41aef57ce8467cc4f1a7546ce8e9957f850d4811
  1. cuj/
  2. synthetic/
  3. .gitignore
  4. LICENSE
  5. OWNERS