
Updates: - Guides added for adding experimental attribute to a story and when to do so. - How to run perf tests locally is added to the document Bug: none Change-Id: Ie2c3f34906d185cd3992e4a614c49f43e4c3ad4f Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2210632 Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org> Commit-Queue: Behdad Bakhshinategh <behdadb@chromium.org> Cr-Commit-Position: refs/heads/master@{#771156}