[Webkit-unassigned] [Bug 211785] [Wheel event region] Add support for getting wheel event region from ScrollingTree

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=211785

--- Comment #5 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
Comment on attachment 399142
  --> https://bugs.webkit.org/attachment.cgi?id=399142
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=399142&action=review

>> Source/WebCore/page/scrolling/mac/ScrollingTreeMac.mm:194
>> +    LockHolder lockHolder(m_layerHitTestMutex);
> 
> Does this lock need to be held all the way to the end? I don’t fully understand what is being guarded.

This lock guards CALayers and PlatformCALayers, so the answer is yes.

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