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Reland #2 "[LCP] Add animated image support"
This is a manual reland of https://chromium-review.googlesource.com/c/chromium/src/+/3247449 The difference from the previous reland is that the browser tests now include 2 separate timeouts and a double rAF, to ensure that the presentation timestamp taken is far enough from both the time the first frame is sent as well as from the time the second frame is sent. More importantly, the test now actually is looking at the UKM metric, rather than at the histogram. Original change's description: > [LCP] Add animated image support > > This CL adds support for better handling of animated images in LCP: > * A new attribute is exposing the first animated frame's paint time > (behind a flag). > * `startTime` is not changed. > * The PageLoadMetrics reported for LCP are set to that first frame paint > time for animated images (behind another flag). > * Entries are not emitted until the image is loaded. > > Relevant spec issue: > w3c/largest-contentful-paint#83 Bug: 1260953 Change-Id: I34070bd90a74ed44281da63b547f13d9669f389b Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3250690 Reviewed-by: Nicolás Peña Moreno <[email protected]> Commit-Queue: Yoav Weiss <[email protected]> Cr-Commit-Position: refs/heads/main@{#936516} NOKEYCHECK=True GitOrigin-RevId: 0955a5d72e1eb06e110395a376c8f254473818a6
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Yoav Weiss
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Oct 29, 2021
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