[Webkit-unassigned] [Bug 284976] New: Add a feature flag for remote snapshotting

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=284976

            Bug ID: 284976
           Summary: Add a feature flag for remote snapshotting
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sabouhallawa at apple.com

Currently snapshotting a page to an image or a PDFDocument has to go through this IPC workflow: UIProcess -> WebProcess -> UIProcess. After 288113 at main and with site isolation enabled, snapshotting will go through the following IPC workflow: UIProcess -> WebProcess -> GPUProcess -> UIProcess. So any WebProcess can't see the drawing of the other WebProcesses.

To address the review comment https://github.com/WebKit/WebKit/pull/37756#discussion_r1891010340, a new feature flag will be introduced to allow testing the remote snapshotting separate from the site isolation. If site isolation is enabled, the main frame has to compose itself with all the remote iframes to get the correct snapshotting. This will be done in future patches.

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