Revert of IntersectionObserver: use an idle callback to send notifications.

third_party/WebKit/LayoutTests/intersection-observer/root-margin.html

Index: third_party/WebKit/LayoutTests/intersection-observer/root-margin.html
diff --git a/third_party/WebKit/LayoutTests/intersection-observer/root-margin.html b/third_party/WebKit/LayoutTests/intersection-observer/root-margin.html
index dda62ea367ecfadba79eaaab46948248591c025b..c5dd9433cd2effcacf160c4fcc6a0aa25e56ee66 100644
--- a/third_party/WebKit/LayoutTests/intersection-observer/root-margin.html
+++ b/third_party/WebKit/LayoutTests/intersection-observer/root-margin.html
@@ -10,84 +10,83 @@
 <div style="width:100%; height:700px;"></div>
 
 <script>
-description("Intersection observer test with root margin and implicit root.");
-var target = document.getElementById("target");
-var entries = [];
-var observer = new IntersectionObserver(
-    changes => { entries = entries.concat(changes) },
-    { rootMargin: "10px 20% 40% 30px" }
-);
+  description("Intersection observer test with root margin and implicit root.");
+  var target = document.getElementById("target");
+  var entries = [];
 
-shouldNotThrow("new IntersectionObserver(c => {}, { rootMargin: '1.4px' })");
-shouldNotThrow("new IntersectionObserver(c => {}, { rootMargin: '1.4px 2px' })");
-shouldNotThrow("new IntersectionObserver(c => {}, { rootMargin: '1.4px 2px 3%' })");
-shouldNotThrow("new IntersectionObserver(c => {}, { rootMargin: '1.4px 2px 3% 40px junk junk junk' })");
+  function observer_callback(changes) {
+    for (var i in changes)
+      entries.push(changes[i]);
+  }
 
-onload = function() {
+  var observer = new IntersectionObserver(observer_callback, {
+    rootMargin: "10px 20% 40% 30px"
+  });
   observer.observe(target);
-  entries = entries.concat(observer.takeRecords());
-  shouldBeEqualToNumber("entries.length", 0);
-  // See README for explanation of double RAF.
-  requestAnimationFrame(() => { requestAnimationFrame(step0) });
-}
 
-function step0() {
-  entries = entries.concat(observer.takeRecords());
-  shouldBeEqualToNumber("entries.length", 0);
-  document.scrollingElement.scrollLeft = 100;
-  requestAnimationFrame(step1);
-}
+  function step0() {
+    setTimeout(function() {
+      shouldNotThrow("new IntersectionObserver(observer_callback, { rootMargin: '1.4px' })");
+      shouldNotThrow("new IntersectionObserver(observer_callback, { rootMargin: '1.4px 2px' })");
+      shouldNotThrow("new IntersectionObserver(observer_callback, { rootMargin: '1.4px 2px 3%' })");
+      shouldNotThrow("new IntersectionObserver(observer_callback, { rootMargin: '1.4px 2px 3% 40px junk junk junk' })");
+      shouldBeEqualToNumber("entries.length", 0);
+      document.scrollingElement.scrollLeft = 100;
+      requestAnimationFrame(step1);
+    });
+  }
 
-function step1() {
-  entries = entries.concat(observer.takeRecords());
-  shouldBeEqualToNumber("entries.length", 1);
-  if (entries.length > 0) {
-    shouldBeEqualToNumber("entries.length", 1);
-    shouldBeEqualToNumber("entries[0].boundingClientRect.left", 912);
-    shouldBeEqualToNumber("entries[0].boundingClientRect.right", 1012);
-    shouldBeEqualToNumber("entries[0].boundingClientRect.top", 708);
-    shouldBeEqualToNumber("entries[0].boundingClientRect.bottom", 808);
-    shouldBeEqualToNumber("entries[0].intersectionRect.left", 912);
-    shouldBeEqualToNumber("entries[0].intersectionRect.right", 942);
-    shouldBeEqualToNumber("entries[0].intersectionRect.top", 708);
-    shouldBeEqualToNumber("entries[0].intersectionRect.bottom", 808);
-    shouldBeEqualToNumber("entries[0].rootBounds.left", -30);
-    shouldBeEqualToNumber("entries[0].rootBounds.right", 942);
-    shouldBeEqualToNumber("entries[0].rootBounds.top", -10);
-    shouldBeEqualToNumber("entries[0].rootBounds.bottom", 819);
-    shouldEvaluateToSameObject("entries[0].target", target);
+  function step1() {
+    setTimeout(function() {
+      shouldBeEqualToNumber("entries.length", 1);
+      shouldBeEqualToNumber("entries[0].boundingClientRect.left", 912);
+      shouldBeEqualToNumber("entries[0].boundingClientRect.right", 1012);
+      shouldBeEqualToNumber("entries[0].boundingClientRect.top", 708);
+      shouldBeEqualToNumber("entries[0].boundingClientRect.bottom", 808);
+      shouldBeEqualToNumber("entries[0].intersectionRect.left", 912);
+      shouldBeEqualToNumber("entries[0].intersectionRect.right", 942);
+      shouldBeEqualToNumber("entries[0].intersectionRect.top", 708);
+      shouldBeEqualToNumber("entries[0].intersectionRect.bottom", 808);
+      shouldBeEqualToNumber("entries[0].rootBounds.left", -30);
+      shouldBeEqualToNumber("entries[0].rootBounds.right", 942);
+      shouldBeEqualToNumber("entries[0].rootBounds.top", -10);
+      shouldBeEqualToNumber("entries[0].rootBounds.bottom", 819);
+      shouldEvaluateToSameObject("entries[0].target", target);
+      document.scrollingElement.scrollTop = 800;
+      requestAnimationFrame(step2);
+    });
   }
-  document.scrollingElement.scrollTop = 800;
-  requestAnimationFrame(step2);
-}
 
-function step2() {
-  entries = entries.concat(observer.takeRecords());
-  shouldBeEqualToNumber("entries.length", 1);
-  document.scrollingElement.scrollTop = 900;
-  requestAnimationFrame(step3);
-}
+  function step2() {
+    setTimeout(function() {
+      shouldBeEqualToNumber("entries.length", 1);
+      document.scrollingElement.scrollTop = 900;
+      requestAnimationFrame(step3);
+    });
+  }
 
-function step3() {
-  entries = entries.concat(observer.takeRecords());
-  shouldBeEqualToNumber("entries.length", 2);
-  if (entries.length > 1) {
-    shouldBeEqualToNumber("entries[1].boundingClientRect.left", 912);
-    shouldBeEqualToNumber("entries[1].boundingClientRect.right", 1012);
-    shouldBeEqualToNumber("entries[1].boundingClientRect.top", -192);
-    shouldBeEqualToNumber("entries[1].boundingClientRect.bottom", -92);
-    shouldBeEqualToNumber("entries[1].intersectionRect.left", 0);
-    shouldBeEqualToNumber("entries[1].intersectionRect.right", 0);
-    shouldBeEqualToNumber("entries[1].intersectionRect.top", 0);
-    shouldBeEqualToNumber("entries[1].intersectionRect.bottom", 0);
-    shouldBeEqualToNumber("entries[1].rootBounds.left", -30);
-    shouldBeEqualToNumber("entries[1].rootBounds.right", 942);
-    shouldBeEqualToNumber("entries[1].rootBounds.top", -10);
-    shouldBeEqualToNumber("entries[1].rootBounds.bottom", 819);
-    shouldEvaluateToSameObject("entries[1].target", target);
+  function step3() {
+    setTimeout(function() {
+      shouldBeEqualToNumber("entries.length", 2);
+      shouldBeEqualToNumber("entries[1].boundingClientRect.left", 912);
+      shouldBeEqualToNumber("entries[1].boundingClientRect.right", 1012);
+      shouldBeEqualToNumber("entries[1].boundingClientRect.top", -192);
+      shouldBeEqualToNumber("entries[1].boundingClientRect.bottom", -92);
+      shouldBeEqualToNumber("entries[1].intersectionRect.left", 0);
+      shouldBeEqualToNumber("entries[1].intersectionRect.right", 0);
+      shouldBeEqualToNumber("entries[1].intersectionRect.top", 0);
+      shouldBeEqualToNumber("entries[1].intersectionRect.bottom", 0);
+      shouldBeEqualToNumber("entries[1].rootBounds.left", -30);
+      shouldBeEqualToNumber("entries[1].rootBounds.right", 942);
+      shouldBeEqualToNumber("entries[1].rootBounds.top", -10);
+      shouldBeEqualToNumber("entries[1].rootBounds.bottom", 819);
+      shouldEvaluateToSameObject("entries[1].target", target);
+
+      finishJSTest();
+      document.scrollingElement.scrollLeft = 0;
+      document.scrollingElement.scrollTop = 0;
+    });
   }
-  finishJSTest();
-  document.scrollingElement.scrollLeft = 0;
-  document.scrollingElement.scrollTop = 0;
-}
+
+  step0();
 </script>