commit b082d3309844bbbac26a5f4af42043ec875ba687
author Lingqi Chi <lingqi@chromium.org> Fri Nov 29 16:24:28 2024
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> Fri Nov 29 16:24:28 2024
tree a44f3e35912202c4843545fa3350b6e8a16c73b2
parent c246bcc072ade3680c63e2107f75a4d511281ecf

[Prerender] Add a feature to enable lazy loading image for invisible
pages.

Before this CL, all image with loading=lazy attribute will be loaded
if they are on invisible pages, including prerendering.
This is a trade-off between loading as many resources as possible for
invisible pages and saving as many resources are possible for invisible
pages as the viewport they are in is invisible.

The pros for the latter are: (credit to barrypollard@)
- saving users' network bandwidth.
- let the renderer processes focus on the most important work when they
  are invisible to reduce contention.
- saving website's resources as some prerender pages may never be shown
  to users.

Specification does not set restriction for UA, so we'd like to try
another path, to respect this attribute for prerendering pages and
all invisible pages.

This CL adds a three-valued feature parameter to allow us to
experiment and find the best behavior.

Bug: 381110833
Change-Id: I0899423d906b4b65b2d10545930e7218c3f2fc7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6055522
Reviewed-by: Domenic Denicola <domenic@chromium.org>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Lingqi Chi <lingqi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1389836}