tree aca0380d7ffeb3dd111de9cf7d9cb74dc89aafe3
parent f6bbf4828461d29ce29fb99c9548957f9ddcf810
author rniwa@webkit.org <rniwa@webkit.org@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1570912447 +0000
committer rniwa@webkit.org <rniwa@webkit.org@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1570912447 +0000

Source/WebCore:
Invoke callbacks registered by requestIdleCallback
https://bugs.webkit.org/show_bug.cgi?id=202824

Reviewed by Antti Koivisto.

Invoke callbacks registered by requestIdleCallback unless it's canceled.

To do this, this patch introduces WindowEventLoop class, which represents the HTML5 event loop:
https://html.spec.whatwg.org/multipage/webappapis.html#window-event-loop

Because each and only each agent cluster is meant to have its own window event loop, this class will be shared
across multiple documents of the same registrable domain:
https://html.spec.whatwg.org/multipage/webappapis.html#integration-with-the-javascript-agent-cluster-formalism

Tests: requestidlecallback/requestidlecallback-is-called.html
       requestidlecallback/requestidlecallback-is-not-called-when-canceled.html

* Sources.txt:
* WebCore.xcodeproj/project.pbxproj:
* dom/Document.cpp:
(WebCore::Document::eventLoop): Added.
(WebCore::Document::requestIdleCallback): Associate IdleCallbackController with this document.
* dom/Document.h:
(WebCore::Document::idleCallbackController): Added. Used for release assertions.
* dom/IdleCallbackController.cpp:
(WebCore::IdleCallbackController::IdleCallbackController): Keeps a weak pointer to Document.
(WebCore::IdleCallbackController::queueIdleCallback):
(WebCore::IdleCallbackController::removeIdleCallback):
(WebCore::IdleCallbackController::queueTaskToStartIdlePeriod): Added.
(WebCore::IdleCallbackController::startIdlePeriod): Added. Implements the start an idle period algorithm:
https://w3c.github.io/requestidlecallback/#start-an-idle-period-algorithm
(WebCore::IdleCallbackController::queueTaskToInvokeIdleCallbacks): Added.
(WebCore::IdleCallbackController::invokeIdleCallbacks): Added. The invoke idle callback timeout algorithm:
https://w3c.github.io/requestidlecallback/#invoke-idle-callback-timeout-algorithm
* dom/IdleCallbackController.h:
* dom/IdleDeadline.h:
* dom/WindowEventLoop.cpp: Added.
(WebCore::WindowEventLoop::create): Added.
(WebCore::WindowEventLoop::WindowEventLoop): Added.
(WebCore::WindowEventLoop::queueTask): Added.
(WebCore::WindowEventLoop::run): Added.
* dom/WindowEventLoop.h: Added.
* page/Page.cpp:
(WebCore::Page::updateRendering): Added comments for the missing pieces.

LayoutTests:
Invoke callback registered by requestIdleCallback
https://bugs.webkit.org/show_bug.cgi?id=202824

Reviewed by Antti Koivisto.

Added basic regression tests. The second test (requestidlecallback-is-not-called-when-canceled.html)
found a spec bug (https://github.com/w3c/requestidlecallback/issues/83).

* requestidlecallback/requestidlecallback-is-called-expected.txt: Added.
* requestidlecallback/requestidlecallback-is-called.html: Added.
* requestidlecallback/requestidlecallback-is-not-called-when-canceled-expected.txt: Added.
* requestidlecallback/requestidlecallback-is-not-called-when-canceled.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@251050 268f45cc-cd09-0410-ab3c-d52691b4dbfc