[Webkit-unassigned] [Bug 194832] New: Chrome freezes when doing a Translate with Intersection Observer enabled

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=194832

            Bug ID: 194832
           Summary: Chrome freezes when doing a Translate with
                    Intersection Observer enabled
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

The Chrome browser freezes when doing a 'Translate' when Intersection Observer is available.

To reproduce:
1. Install Chrome on iOS 12.2 beta
2. Load m.yahoo.co.jp
3. When Chrome prompts you to translate the page, tap Translate
4. Chrome hangs for a long time.

I've confirmed that disabling Intersection Observer fixes this.

What Chrome seems to be doing is using is injecting a user script that makes use of Intersection Observer for the Translate feature, and then not handling the flood of callbacks that happen (Chrome is spending a lot of time under UIView snapshotting).

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