commit 10bb83df93723eeecec3590fdf14904adf835795
author Kunihiko Sakamoto <ksakamoto@chromium.org> Thu Dec 06 03:10:20 2018
committer Commit Bot <commit-bot@chromium.org> Thu Dec 06 03:10:20 2018
tree 29b78295a9be85af3577b25d3698ea629dd626c9
parent 198763278fb66b3a7135b29c3817f2dc5df7d6f4

Defer preloads with imagesrcset/imagesizes until the first chunk is parsed

Preloads from link headers with the media attribute are deferred until
the first chunk of the document is parsed, so that ViewportDescription
from the preload scanner can be taken into account. Preloads with
imagesrcset or imagesizes depend on the viewport, so such preloads
should be deferred as well.

Note: This applies to only preloads dispatched by DocumentLoader. Link
rel=preload headers from subresources (e.g. prefetch) are not deferred
even if they have media/imagesrcset/imagesizes attributes.

Bug: 813452
Change-Id: Iccc6ec12cf5bd53b71824463378c854cbd23a5ba
Reviewed-on: https://chromium-review.googlesource.com/c/1360193
Reviewed-by: Dominic Farolino <domfarolino@gmail.com>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Yoav Weiss <yoavweiss@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#614253}