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

third_party/WebKit/LayoutTests/intersection-observer/containing-block.html

Index: third_party/WebKit/LayoutTests/intersection-observer/containing-block.html
diff --git a/third_party/WebKit/LayoutTests/intersection-observer/containing-block.html b/third_party/WebKit/LayoutTests/intersection-observer/containing-block.html
index 819ec5fabb56d591c05bc4c601b16078449fc36a..f7db8fb8ee8d9878185571d268a8c5056a4582ad 100644
--- a/third_party/WebKit/LayoutTests/intersection-observer/containing-block.html
+++ b/third_party/WebKit/LayoutTests/intersection-observer/containing-block.html
@@ -19,79 +19,81 @@
 </div>
 
 <script>
-description("Test that no notifications are generated when root is not in the containing block chain of target.");
-var root = document.getElementById("root");
-var target = document.getElementById("target");
-var entries = [];
+  description("Test that no notifications are generated when root is not in the containing block chain of target.");
+  var root = document.getElementById("root");
+  var target = document.getElementById("target");
+  var entries = [];
 
-var observer = new IntersectionObserver(
-    changes => { entries = entries.concat(changes) },
-    { root: root }
-);
+  function observer_callback(changes) {
+    changes.forEach(function(e) { entries.push(e) });
+  }
+  new IntersectionObserver(observer_callback, {root: root}).observe(target);
 
-onload = function() {
-  observer.observe(target);
-  shouldBeEqualToNumber("entries.length", 0);
-  target.style.top = "10px";
-  // See README for explanation of double RAF.
-  requestAnimationFrame(() => { requestAnimationFrame(step1) });
-};
+  function step0() {
+    setTimeout(function() {
+      shouldBeEqualToNumber("entries.length", 0);
+      target.style.top = "10px";
+      requestAnimationFrame(step1);
+    });
+  }
 
-function step1() {
-  entries = entries.concat(observer.takeRecords());
-  shouldBeEqualToNumber("entries.length", 1);
-  if (entries.length > 0) {
-    shouldBeEqualToNumber("entries[0].boundingClientRect.left", 58);
-    shouldBeEqualToNumber("entries[0].boundingClientRect.right", 158);
-    shouldBeEqualToNumber("entries[0].boundingClientRect.top", 18);
-    shouldBeEqualToNumber("entries[0].boundingClientRect.bottom", 118);
-    shouldBeEqualToNumber("entries[0].intersectionRect.left", 58);
-    shouldBeEqualToNumber("entries[0].intersectionRect.right", 158);
-    shouldBeEqualToNumber("entries[0].intersectionRect.top", 18);
-    shouldBeEqualToNumber("entries[0].intersectionRect.bottom", 118);
-    shouldBeEqualToNumber("entries[0].rootBounds.left", 8);
-    shouldBeEqualToNumber("entries[0].rootBounds.right", 193);
-    shouldBeEqualToNumber("entries[0].rootBounds.top", 8);
-    shouldBeEqualToNumber("entries[0].rootBounds.bottom", 208);
-    shouldEvaluateToSameObject("entries[0].target", target);
+  function step1() {
+    setTimeout(function() {
+      shouldBeEqualToNumber("entries.length", 1);
+      shouldBeEqualToNumber("entries[0].boundingClientRect.left", 58);
+      shouldBeEqualToNumber("entries[0].boundingClientRect.right", 158);
+      shouldBeEqualToNumber("entries[0].boundingClientRect.top", 18);
+      shouldBeEqualToNumber("entries[0].boundingClientRect.bottom", 118);
+      shouldBeEqualToNumber("entries[0].intersectionRect.left", 58);
+      shouldBeEqualToNumber("entries[0].intersectionRect.right", 158);
+      shouldBeEqualToNumber("entries[0].intersectionRect.top", 18);
+      shouldBeEqualToNumber("entries[0].intersectionRect.bottom", 118);
+      shouldBeEqualToNumber("entries[0].rootBounds.left", 8);
+      shouldBeEqualToNumber("entries[0].rootBounds.right", 193);
+      shouldBeEqualToNumber("entries[0].rootBounds.top", 8);
+      shouldBeEqualToNumber("entries[0].rootBounds.bottom", 208);
+      shouldEvaluateToSameObject("entries[0].target", target);
+      target.style.top = "250px";
+      requestAnimationFrame(step2);
+    });
   }
-  target.style.top = "250px";
-  requestAnimationFrame(step2);
-}
 
-function step2() {
-  entries = entries.concat(observer.takeRecords());
-  shouldBeEqualToNumber("entries.length", 2);
-  if (entries.length > 1) {
-    shouldBeEqualToNumber("entries[1].boundingClientRect.left", 58);
-    shouldBeEqualToNumber("entries[1].boundingClientRect.right", 158);
-    shouldBeEqualToNumber("entries[1].boundingClientRect.top", 258);
-    shouldBeEqualToNumber("entries[1].boundingClientRect.bottom", 358);
-    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", 8);
-    shouldBeEqualToNumber("entries[1].rootBounds.right", 193);
-    shouldBeEqualToNumber("entries[1].rootBounds.top", 8);
-    shouldBeEqualToNumber("entries[1].rootBounds.bottom", 208);
-    shouldEvaluateToSameObject("entries[1].target", target);
+  function step2() {
+    setTimeout(function() {
+      shouldBeEqualToNumber("entries.length", 2);
+      shouldBeEqualToNumber("entries[1].boundingClientRect.left", 58);
+      shouldBeEqualToNumber("entries[1].boundingClientRect.right", 158);
+      shouldBeEqualToNumber("entries[1].boundingClientRect.top", 258);
+      shouldBeEqualToNumber("entries[1].boundingClientRect.bottom", 358);
+      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", 8);
+      shouldBeEqualToNumber("entries[1].rootBounds.right", 193);
+      shouldBeEqualToNumber("entries[1].rootBounds.top", 8);
+      shouldBeEqualToNumber("entries[1].rootBounds.bottom", 208);
+      shouldEvaluateToSameObject("entries[1].target", target);
+      root.style.position = "static";
+      target.style.top = "10px";
+      requestAnimationFrame(step3);
+    });
   }
-  root.style.position = "static";
-  target.style.top = "10px";
-  requestAnimationFrame(step3);
-}
 
-function step3() {
-  entries = entries.concat(observer.takeRecords());
-  shouldBeEqualToNumber("entries.length", 2);
-  target.style.top = "250px";
-  requestAnimationFrame(step4);
-}
+  function step3() {
+    setTimeout(function() {
+      shouldBeEqualToNumber("entries.length", 2);
+      target.style.top = "250px";
+      requestAnimationFrame(step4);
+    });
+  }
 
-function step4() {
-  entries = entries.concat(observer.takeRecords());
-  shouldBeEqualToNumber("entries.length", 2);
-  finishJSTest();
-}
+  function step4() {
+    setTimeout(function() {
+      shouldBeEqualToNumber("entries.length", 2);
+      finishJSTest();
+    });
+  }
+
+  step0();
 </script>