Implement requestIdleCallback API

LayoutTests/webexposed/global-interface-listing-expected.txt

Index: LayoutTests/webexposed/global-interface-listing-expected.txt
diff --git a/LayoutTests/webexposed/global-interface-listing-expected.txt b/LayoutTests/webexposed/global-interface-listing-expected.txt
index 69bdbb1c94e684af038ffe89278e4b5346270a03..896366ac82daa1eb3b458efe6d54fff318e7ede8 100644
--- a/LayoutTests/webexposed/global-interface-listing-expected.txt
+++ b/LayoutTests/webexposed/global-interface-listing-expected.txt
@@ -3050,6 +3050,10 @@ interface IDBVersionChangeEvent
     getter newVersion
     getter oldVersion
     method constructor
+interface IdleCallbackDeadline
+    getter didTimeout
+    method constructor
+    method timeRemaining
 interface Image
     method constructor
 interface ImageBitmap
@@ -6286,6 +6290,7 @@ interface Window
     method blur
     method btoa
     method cancelAnimationFrame
+    method cancelIdleCallback
     method captureEvents
     method clearInterval
     method clearTimeout
@@ -6310,6 +6315,7 @@ interface Window
     method prompt
     method releaseEvents
     method requestAnimationFrame
+    method requestIdleCallback
     method resizeBy
     method resizeTo
     method scroll