Bug 260478 – [WPE][GTK] Enable requestIdleCallback

• Status: NEW
• Component: WebKitGTK

[Michael Catanzaro]

We need to enable requestIdleCallback, as in bug #260369. Ryosuke has left us this hint:

"""
You need to implement these functions: RunLoopObserver::schedule, RunLoopObserver::invalidate, and RunLoopObserver::isScheduled():

https://github.com/WebKit/WebKit/blob/main/Source/WebCore/platform/RunLoopObserver.cpp
"""

Unfortunately, looking at RunLoopObserverCF, I can't think of any way to map this to GMainContext, so it's probably not possible. We shouldn't try to modify GMainContext unless there are no other options. This requires further investigation.

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We should also think about the problem I describe here: https://bugs.webkit.org/show_bug.cgi?id=164193#c18, i.e. we need to make sure web content cannot perform a denial of service that would prevent WebKit from running WebKit's own callbacks.

[Ryosuke Niwa]

FWIW, the feature may work out of box right now because of the code I added to WindowEventLoop:
https://github.com/WebKit/WebKit/blob/main/Source/WebCore/dom/WindowEventLoop.cpp#L189

Might be worth testing to see if you can enable the feature anyway without implementing RunLoopObserver.