Commits on Sep 30, 2021

1. Prerender: Upstream a basic test for SpeculationRules triggered prere… …

   …ndering to WPT
   
   This CL upstreams a basic prerender test that confirms
   `document.prerendering` and `document.onprerenderingchange` event on
   pages prerendered by SpeculationRules to the WPT repository.
   
   > Directory structure
   
   This introduces a new directory speculation-rules/ and a sub directory
   speculation-rules/prerender/. Tests for other pre* features triggered by
   SpeculationRules will be placed in subdirectories of speculation-rules/.
   
   > Feature detection
   
   The test checks if SpeculationRules is available using
   `HTMLScriptElement.supports('speculationrules')`. This doesn't exactly
   check if SpeculationRules triggered prerendering is available, but
   currently this is the only way to (roughly) detect the feature and still
   useful for avoiding timeout on other user agents.
   
   > For VIRTUAL_OWNERS
   
   This CL just moves the existing test to the new directory and updates
   the VirtualTestSuites configuration for the directory, so this doesn't
   increase the number of tests to run.
   
   Change-Id: I3fbd729de42f560b9157ff1a3b4ba6e4e973a0d6
   Bug: 1253158
   Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3168517
   Reviewed-by: Kent Tamura <tkent@chromium.org>
   Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
   Reviewed-by: Jeremy Roman <jbroman@chromium.org>
   Reviewed-by: Lingqi Chi <lingqi@chromium.org>
   Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
   Cr-Commit-Position: refs/heads/main@{#926625}

   

   nhiroki authored and chromium-wpt-export-bot committed Sep 30, 2021
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