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We have some useful indicators that show which page elements get compositing layers. We should make them available in release builds (they are controlled by 'defaults' settings).
Created an attachment (id=41524) [details]
(From update of attachment 41524 [details])
> + * platform/graphics/mac/WebLayer.mm:
> + (WebCore::if):
Please don't leave a line like this in the change log.