Implement requestIdleCallback API

Source/core/core.gypi

Index: Source/core/core.gypi
diff --git a/Source/core/core.gypi b/Source/core/core.gypi
index 59102d3549e545e45d94194773bae267fbf6f24b..26009cf37929ea492ff9e7b4037b5004ba3b7e7b 100644
--- a/Source/core/core.gypi
+++ b/Source/core/core.gypi
@@ -69,6 +69,8 @@
             'dom/Float32Array.idl',
             'dom/Float64Array.idl',
             'dom/FrameRequestCallback.idl',
+            'dom/IdleCallbackDeadline.idl',
+            'dom/IdleRequestCallback.idl',
             'dom/Int16Array.idl',
             'dom/Int32Array.idl',
             'dom/Int8Array.idl',
@@ -2282,6 +2284,9 @@
             'dom/GlobalEventHandlers.h',
             'dom/IconURL.cpp',
             'dom/IconURL.h',
+            'dom/IdleCallbackDeadline.cpp',
+            'dom/IdleCallbackDeadline.h',
+            'dom/IdleRequestCallback.h',
             'dom/IdTargetObserver.cpp',
             'dom/IdTargetObserver.h',
             'dom/IdTargetObserverRegistry.cpp',
@@ -2365,6 +2370,8 @@
             'dom/ScriptableDocumentParser.h',
             'dom/ScriptedAnimationController.cpp',
             'dom/ScriptedAnimationController.h',
+            'dom/ScriptedIdleTaskController.cpp',
+            'dom/ScriptedIdleTaskController.h',
             'dom/SecurityContext.cpp',
             'dom/SecurityContext.h',
             'dom/SelectorQuery.cpp',