commit 74e9da1850ff178b734ca11458c09d2ec794433c
author Javier Castro <jacastro@chromium.org> Wed Oct 15 00:21:26 2025
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> Wed Oct 15 00:21:26 2025
tree 4b1d55b8582981f3ef02969c502959b1849846cd
parent f825fa4cecb095b65a9d99a52c0135bc0d332ac8

Define ProcessSelectionUserData for ProcessSelectionDeferringCondition

Implementations of ProcessSelectionDeferringCondition, which are defined
by an embedder, need an extensible way to communicate information back
to the process selection logic. NavigationHandleUserData didn't work for
this use case because the navigation handle may not be available where
the process selection data is needed (like when SiteInfo gets created).
ProcessSelectionUserData solves this in a way that won't require making
further changes to the public definition nor further changes to
non-embedder data (such as UrlInfo). This change will allow the first
client, which will land in crrev.com/c/6897186 to communicate data back
to the process selection logic without needing to build additional
caching mechanisms.

This change works as follows:

1. We define a ProcessSelectionUserData that extends
   base::SupportsUserData.
  a. This serves as the container for the data and is added to a
     NavigationRequest on construction.
  b. We add a accessor function to NavigationHandle and provide that as
     a convenience function on ProcessSelectionDeferringCondition so
     that implementations of ProcessSelectionDeferringCondition know
     that this data container is available.
  c. UrlInfo is given a new field to hold the ProcessSelectionUserData.
     The field is populated when the UrlInfo is created by
     NavigationRequest::GetUrlInfo().

2. We define a ProcessSelectionUserData::Data that extends
   base::SupportsUserData::Data.
  a. Any ProcessSelectionDeferringCondition can define a data container
     and extend ProcessSelectionUserData::Data to simplify data setting
     and accessing. This is done in a manner similar to other user data
     implementations such as WebContentsUserData.
  b. The ProcessSelectionDeferringCondition can set this data on the
     navigation_handle during its lifetime

3. The process selection logic can access the data later using
   ProcessSelectionUserData::FromProcessSelectionUserData on the
   appropriate data type.


Change-Id: Ic8530e02a9752b4ae7b3f3f013e2bde917069f73
Bug: 434009835
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6974321
Commit-Queue: Javier Castro <jacastro@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1529877}