IntersectionObserver: Always send an initial notification.

third_party/WebKit/LayoutTests/intersection-observer/multiple-targets.html

Index: third_party/WebKit/LayoutTests/intersection-observer/multiple-targets.html
diff --git a/third_party/WebKit/LayoutTests/intersection-observer/multiple-targets.html b/third_party/WebKit/LayoutTests/intersection-observer/multiple-targets.html
index 6c75d6e6f0c1de685105d9cd7861e12a1151edfb..06c52adfbdf1595a4ed3eda80ec830ab93076907 100644
--- a/third_party/WebKit/LayoutTests/intersection-observer/multiple-targets.html
+++ b/third_party/WebKit/LayoutTests/intersection-observer/multiple-targets.html
@@ -47,34 +47,37 @@ runTestCycle(function() {
   observer.observe(target3);
   entries = entries.concat(observer.takeRecords());
   assert_equals(entries.length, 0, "No initial notifications.");
-  runTestCycle(step0, "No notifications after first rAF.");
+  runTestCycle(step0, "First rAF.");
 }, "One observer with multiple targets.");
 
 function step0() {
   document.scrollingElement.scrollTop = 150;
   runTestCycle(step1, "document.scrollingElement.scrollTop = 150");
-  assert_equals(entries.length, 0, "No notifications.");
+  assert_equals(entries.length, 3, "Three initial notifications.");
+  assert_equals(entries[0].target, target1, "entries[0].target === target1");
+  assert_equals(entries[1].target, target2, "entries[1].target === target2");
+  assert_equals(entries[2].target, target3, "entries[2].target === target3");
 }
 
 function step1() {
   document.scrollingElement.scrollTop = 10000;
   runTestCycle(step2, "document.scrollingElement.scrollTop = 10000");
-  assert_equals(entries.length, 1, "One notification.");
-  assert_equals(entries[0].target, target1, "entries[0].target === target1");
+  assert_equals(entries.length, 4, "Four notifications.");
+  assert_equals(entries[3].target, target1, "entries[3].target === target1");
 }
 
 function step2() {
   document.scrollingElement.scrollTop = 0;
   runTestCycle(step3, "document.scrollingElement.scrollTop = 0");
-  assert_equals(entries.length, 3, "Three notifications.");
-  assert_equals(entries[1].target, target2, "entries[1].target === target2");
-  assert_equals(entries[2].target, target3, "entries[2].target === target3");
-}
-
-function step3() {
   assert_equals(entries.length, 6, "Six notifications.");
-  assert_equals(entries[3].target, target1, "entries[3].target === target1");
   assert_equals(entries[4].target, target2, "entries[4].target === target2");
   assert_equals(entries[5].target, target3, "entries[5].target === target3");
 }
+
+function step3() {
+  assert_equals(entries.length, 9, "Nine notifications.");
+  assert_equals(entries[6].target, target1, "entries[6].target === target1");
+  assert_equals(entries[7].target, target2, "entries[7].target === target2");
+  assert_equals(entries[8].target, target3, "entries[8].target === target3");
+}
 </script>