Prerender: Add WPT for prerendering with sendBeacon()
This CL adds a new WPT to test sendBeacon() can be called during
prerendering and onprerenderingchange, and after activation.
Bug: 371971702
Change-Id: Icbc634ab58083e577a41fad4a473498a1f1271c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5914032
Reviewed-by: Lingqi Chi lingqi@chromium.org
Commit-Queue: Hiroki Nakagawa nhiroki@chromium.org
Cr-Commit-Position: refs/heads/main@{#1365320}