IntersectionObserver: Always send an initial notification.

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

Index: third_party/WebKit/LayoutTests/intersection-observer/unclipped-root.html
diff --git a/third_party/WebKit/LayoutTests/intersection-observer/unclipped-root.html b/third_party/WebKit/LayoutTests/intersection-observer/unclipped-root.html
index 40d39ca4bd9250591c250b87ae2bd3a05633dd5a..490b9eb30e404b1ccac3520cc0512a1bb4b0c2ab 100644
--- a/third_party/WebKit/LayoutTests/intersection-observer/unclipped-root.html
+++ b/third_party/WebKit/LayoutTests/intersection-observer/unclipped-root.html
@@ -41,17 +41,17 @@ runTestCycle(function() {
   observer.observe(target);
   entries = entries.concat(observer.takeRecords());
   assert_equals(entries.length, 0, "No initial notifications.");
-  runTestCycle(step0, "First rAF should not generate notifications.");
+  runTestCycle(step0, "First rAF.");
 }, "Test that border bounding box is used to calculate intersection with a non-scrolling root.");
 
 function step0() {
   target.style.transform = "translateY(195px)";
   runTestCycle(step1, "target.style.transform = 'translateY(195px)'");
-  assert_equals(entries.length, 0, "No notifications after first rAF.");
+  checkLastEntry(entries, 0, [15, 115, 315, 415, 0, 0, 0, 0, 8, 182, 8, 222, target]);
 }
 
 function step1() {
   target.style.transform = "";
-  checkLastEntry(entries, 0, [15, 115, 210, 310, 15, 115, 210, 222, 8, 182, 8, 222, target]);
+  checkLastEntry(entries, 1, [15, 115, 210, 310, 15, 115, 210, 222, 8, 182, 8, 222, target]);
 }
 </script>