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

third_party/WebKit/LayoutTests/intersection-observer/same-document-root.html

Index: third_party/WebKit/LayoutTests/intersection-observer/same-document-root.html
diff --git a/third_party/WebKit/LayoutTests/intersection-observer/same-document-root.html b/third_party/WebKit/LayoutTests/intersection-observer/same-document-root.html
index 05a808b3c73091db5105513d8030f2bbd5d2843d..d96f6d1f09007dd2a565cce24a2a26bd3d7bb260 100644
--- a/third_party/WebKit/LayoutTests/intersection-observer/same-document-root.html
+++ b/third_party/WebKit/LayoutTests/intersection-observer/same-document-root.html
@@ -9,107 +9,105 @@
 <div style="width:100%;height:700px;"></div>
 
 <script>
-description("Simple intersection observer test with explicit root and target in the same document.");
-var target = document.getElementById("target");
-var root = document.getElementById("root");
-var entries = [];
-var observer = new IntersectionObserver(
-    changes => { entries = entries.concat(changes) },
-    { root: document.getElementById("root") }
-);
+  description("Simple intersection observer test with explicit root and target in the same document.");
+  var target = document.getElementById("target");
+  var root = document.getElementById("root");
+  var entries = [];
 
-onload = function() {
+  observer_callback = function(changes) {
+    for (var i in changes)
+      entries.push(changes[i]);
+  };
+  var observer = new IntersectionObserver(observer_callback, {"root": document.getElementById("root")});
   observer.observe(target);
-  entries = entries.concat(observer.takeRecords());
-  shouldBeEqualToNumber("entries.length", 0);
-  requestAnimationFrame(() => { requestAnimationFrame(step0) });
-}
 
-// Test that notifications are not generated when the target is overflow clipped by the root.
-function step0() {
-  entries = entries.concat(observer.takeRecords());
-  shouldBeEqualToNumber("entries.length", 0);
-  document.scrollingElement.scrollTop = 600;
-  requestAnimationFrame(step1);
-}
+  // Test that notifications are not generated when the target is overflow clipped by the root.
+  function step0() {
+    setTimeout(function() {
+      shouldBeEqualToNumber("entries.length", 0);
+      document.scrollingElement.scrollTop = 600;
+      requestAnimationFrame(step1);
+    });
+  }
 
-function step1() {
-  entries = entries.concat(observer.takeRecords());
-  shouldBeEqualToNumber("entries.length", 0);
-  root.scrollTop = 150;
-  requestAnimationFrame(step2);
-}
+  function step1() {
+    setTimeout(function() {
+      shouldBeEqualToNumber("entries.length", 0);
+      root.scrollTop = 150;
+      requestAnimationFrame(step2);
+    });
+  }
 
-function step2() {
-  entries = entries.concat(observer.takeRecords());
-  shouldBeEqualToNumber("entries.length", 1);
-  if (entries.length > 0) {
-    shouldBeEqualToNumber("entries[0].boundingClientRect.left", 11);
-    shouldBeEqualToNumber("entries[0].boundingClientRect.right", 111);
-    shouldBeEqualToNumber("entries[0].boundingClientRect.top", 261);
-    shouldBeEqualToNumber("entries[0].boundingClientRect.bottom", 361);
-    shouldBeEqualToNumber("entries[0].intersectionRect.left", 11);
-    shouldBeEqualToNumber("entries[0].intersectionRect.right", 111);
-    shouldBeEqualToNumber("entries[0].intersectionRect.top", 261);
-    shouldBeEqualToNumber("entries[0].intersectionRect.bottom", 311);
-    shouldBeEqualToNumber("entries[0].rootBounds.left", 11);
-    shouldBeEqualToNumber("entries[0].rootBounds.right", 111);
-    shouldBeEqualToNumber("entries[0].rootBounds.top", 111);
-    shouldBeEqualToNumber("entries[0].rootBounds.bottom", 311);
-    shouldEvaluateToSameObject("entries[0].target", target);
+  function step2() {
+    setTimeout(function() {
+      shouldBeEqualToNumber("entries.length", 1);
+      shouldBeEqualToNumber("entries[0].boundingClientRect.left", 11);
+      shouldBeEqualToNumber("entries[0].boundingClientRect.right", 111);
+      shouldBeEqualToNumber("entries[0].boundingClientRect.top", 261);
+      shouldBeEqualToNumber("entries[0].boundingClientRect.bottom", 361);
+      shouldBeEqualToNumber("entries[0].intersectionRect.left", 11);
+      shouldBeEqualToNumber("entries[0].intersectionRect.right", 111);
+      shouldBeEqualToNumber("entries[0].intersectionRect.top", 261);
+      shouldBeEqualToNumber("entries[0].intersectionRect.bottom", 311);
+      shouldBeEqualToNumber("entries[0].rootBounds.left", 11);
+      shouldBeEqualToNumber("entries[0].rootBounds.right", 111);
+      shouldBeEqualToNumber("entries[0].rootBounds.top", 111);
+      shouldBeEqualToNumber("entries[0].rootBounds.bottom", 311);
+      shouldEvaluateToSameObject("entries[0].target", target);
+      document.scrollingElement.scrollTop = 0;
+      requestAnimationFrame(step3);
+    });
   }
-  document.scrollingElement.scrollTop = 0;
-  requestAnimationFrame(step3);
-}
 
-function step3() {
-  entries = entries.concat(observer.takeRecords());
-  shouldBeEqualToNumber("entries.length", 1);
-  root.scrollTop = 0;
-  requestAnimationFrame(step4);
-}
+  function step3() {
+    setTimeout(function() {
+      shouldBeEqualToNumber("entries.length", 1);
+      root.scrollTop = 0;
+      requestAnimationFrame(step4);
+    });
+  }
 
-function step4() {
-  entries = entries.concat(observer.takeRecords());
-  shouldBeEqualToNumber("entries.length", 2);
-  if (entries.length > 1) {
-    shouldBeEqualToNumber("entries[1].boundingClientRect.left", 11);
-    shouldBeEqualToNumber("entries[1].boundingClientRect.right", 111);
-    shouldBeEqualToNumber("entries[1].boundingClientRect.top", 1011);
-    shouldBeEqualToNumber("entries[1].boundingClientRect.bottom", 1111);
-    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", 11);
-    shouldBeEqualToNumber("entries[1].rootBounds.right", 111);
-    shouldBeEqualToNumber("entries[1].rootBounds.top", 711);
-    shouldBeEqualToNumber("entries[1].rootBounds.bottom", 911);
-    shouldEvaluateToSameObject("entries[1].target", target);
+  function step4() {
+    setTimeout(function() {
+      shouldBeEqualToNumber("entries.length", 2);
+      shouldBeEqualToNumber("entries[1].boundingClientRect.left", 11);
+      shouldBeEqualToNumber("entries[1].boundingClientRect.right", 111);
+      shouldBeEqualToNumber("entries[1].boundingClientRect.top", 1011);
+      shouldBeEqualToNumber("entries[1].boundingClientRect.bottom", 1111);
+      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", 11);
+      shouldBeEqualToNumber("entries[1].rootBounds.right", 111);
+      shouldBeEqualToNumber("entries[1].rootBounds.top", 711);
+      shouldBeEqualToNumber("entries[1].rootBounds.bottom", 911);
+      shouldEvaluateToSameObject("entries[1].target", target);
+      root.scrollTop = 150;
+      requestAnimationFrame(step5);
+    });
   }
-  root.scrollTop = 150;
-  requestAnimationFrame(step5);
-}
 
-// This tests that notifications are generated even when the root element is off screen.
-function step5() {
-  entries = entries.concat(observer.takeRecords());
-  shouldBeEqualToNumber("entries.length", 3);
-  if (entries.length > 2) {
-    shouldBeEqualToNumber("entries[2].boundingClientRect.left", 11);
-    shouldBeEqualToNumber("entries[2].boundingClientRect.right", 111);
-    shouldBeEqualToNumber("entries[2].boundingClientRect.top", 861);
-    shouldBeEqualToNumber("entries[2].boundingClientRect.bottom", 961);
-    shouldBeEqualToNumber("entries[2].intersectionRect.left", 11);
-    shouldBeEqualToNumber("entries[2].intersectionRect.right", 111);
-    shouldBeEqualToNumber("entries[2].intersectionRect.top", 861);
-    shouldBeEqualToNumber("entries[2].intersectionRect.bottom", 911);
-    shouldBeEqualToNumber("entries[2].rootBounds.left", 11);
-    shouldBeEqualToNumber("entries[2].rootBounds.right", 111);
-    shouldBeEqualToNumber("entries[2].rootBounds.top", 711);
-    shouldBeEqualToNumber("entries[2].rootBounds.bottom", 911);
-    shouldEvaluateToSameObject("entries[2].target", target);
+  // This tests that notifications are generated even when the root element is off screen.
+  function step5() {
+    setTimeout(function() {
+      shouldBeEqualToNumber("entries.length", 3);
+      shouldBeEqualToNumber("entries[2].boundingClientRect.left", 11);
+      shouldBeEqualToNumber("entries[2].boundingClientRect.right", 111);
+      shouldBeEqualToNumber("entries[2].boundingClientRect.top", 861);
+      shouldBeEqualToNumber("entries[2].boundingClientRect.bottom", 961);
+      shouldBeEqualToNumber("entries[2].intersectionRect.left", 11);
+      shouldBeEqualToNumber("entries[2].intersectionRect.right", 111);
+      shouldBeEqualToNumber("entries[2].intersectionRect.top", 861);
+      shouldBeEqualToNumber("entries[2].intersectionRect.bottom", 911);
+      shouldBeEqualToNumber("entries[2].rootBounds.left", 11);
+      shouldBeEqualToNumber("entries[2].rootBounds.right", 111);
+      shouldBeEqualToNumber("entries[2].rootBounds.top", 711);
+      shouldBeEqualToNumber("entries[2].rootBounds.bottom", 911);
+      shouldEvaluateToSameObject("entries[2].target", target);
+      finishJSTest();
+    });
   }
-  finishJSTest();
-}
+
+  step0();
 </script>