[pus] add first wpt_test and test utility #55700
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Since prerender-until-script pages cannot execute scripts, the existing test utilities cannot help test this case. More specifically, prerender-until-script pages cannot tell the initiator pages that they are ready for activation. This CL introduces a server-side handler (pus-handler.py) to coordinate the test. Workflows: 1. The initiator page (pus-initiator-page-template.html) triggers the prerender and simultaneously fetches a signal_url. This fetch is designed to hang on the server. 2. The prerendered page (pus-page-template.html) is allowed to fetch an async script (which also hits the signal_url, but with isprerendering=True). 3. When the server receives the request from the prerendered page, it puts a token in its stash, which in turn unblocks the initiator's hanging fetch. 4. The .then() block of the initiator's fetch then runs, navigating to the prerendered page and causing activation. 5. The (previously blocked) inline script on the prerendered page then executes, verifying that document.prerendering is false and sending the result back to the main test page. Bug: 428500219 Change-Id: I5e1098a6adbf7abfd02f692eb32e93c9093fd501 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7082540 Reviewed-by: Hiroki Nakagawa <[email protected]> Commit-Queue: Lingqi Chi <[email protected]> Cr-Commit-Position: refs/heads/main@{#1536464}
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Since prerender-until-script pages cannot execute scripts, the existing
test utilities cannot help test this case. More specifically,
prerender-until-script pages cannot tell the initiator pages that they
are ready for activation.
This CL introduces a server-side handler (pus-handler.py) to coordinate
the test.
Workflows:
The initiator page (pus-initiator-page-template.html)
triggers the prerender and simultaneously fetches a signal_url. This
fetch is designed to hang on the server.
The prerendered page (pus-page-template.html) is allowed to fetch an
async script (which also hits the signal_url, but with
isprerendering=True).
When the server receives the request from the prerendered page, it
puts a token in its stash, which in turn unblocks the initiator's
hanging fetch.
The .then() block of the initiator's fetch then runs, navigating to
the prerendered page and causing activation.
The (previously blocked) inline script on the prerendered page then
executes, verifying that document.prerendering is false and sending the
result back to the main test page.
Bug: 428500219
Change-Id: I5e1098a6adbf7abfd02f692eb32e93c9093fd501
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7082540
Reviewed-by: Hiroki Nakagawa <[email protected]>
Commit-Queue: Lingqi Chi <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1536464}