commit 055a3549f4b1410a93b85a5931cfe1ecc7b2b00f
author William Liu <liuwilliam@chromium.org> Sun Apr 02 17:21:19 2023
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> Sun Apr 02 17:21:19 2023
tree 9e026ade16a1902120472d63e49ff75cf01b1da7
parent 82d5e77eacab0abc5e2c7447c5350447a03b7b10

[navigation-transitions]: Cache screenshots for navigation entries

Introduce NavigationEntryScreenshot, which preserves a screenshot on the
current NavigationEntry when the user is navigating away from it. The
stored screenshot will later be used to present the user with a preview,
when the user navigates back to this page.

The caching mechanism is composed of the screenshot, the cache and a
global manager. The global manager lives on the BrowserContext and is
responsible for memory budgeting. The cache lives on the primary
NavigationController which owns the NavigationEntry where the
screenshot is stashed.

This CL contains the impl of caching, retrieving and eviction of the
screenshots with unittests. The cache is not integrated with the navigation thus no browsertest.

The code resides in `//content/browser/renderer_host/` because no need
to access WebContents.

[Updated] DD/Explainer (chromium access): https://docs.google.com/document/d/1-7TatVjSL4n-RNyvN_MWdFoOiR6YJ1BjvJKgvym_ArU

Feature EngDoc: https://docs.google.com/document/d/1H99XZHdAWNfbfboHbGdMB97k81AzAxVtPSizAjO2Poc/

PRD (google access): https://docs.google.com/document/d/1JMWzArv0VR-G4xx3a5ku8N5np8mDeGSuvR95kZc8ynY/

Bug: 1415332, 1413521
Change-Id: Icc3b2aa7b5b36ed460ad2ddd1ff5f645a38d2835
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4245857
Reviewed-by: Kyle Charbonneau <kylechar@chromium.org>
Commit-Queue: William Liu <liuwilliam@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1125127}