[IntersectionObserver] Add isIntersecting field.

third_party/WebKit/LayoutTests/intersection-observer/display-none.html

Index: third_party/WebKit/LayoutTests/intersection-observer/display-none.html
diff --git a/third_party/WebKit/LayoutTests/intersection-observer/display-none.html b/third_party/WebKit/LayoutTests/intersection-observer/display-none.html
index 28170f620ac846b243eb85fda10323940a52b438..7d105bf548f6f0467f19cb414e1b3a1f74a7af18 100644
--- a/third_party/WebKit/LayoutTests/intersection-observer/display-none.html
+++ b/third_party/WebKit/LayoutTests/intersection-observer/display-none.html
@@ -38,17 +38,17 @@ runTestCycle(function() {
 
 function step0() {
   runTestCycle(step1, "Not-intersecting notification after setting display:none on target.");
-  checkLastEntry(entries, 0, [8, 108, 8, 108, 8, 108, 8, 108, 0, 800, 0, 600, target]);
+  checkLastEntry(entries, 0, [8, 108, 8, 108, 8, 108, 8, 108, 0, 800, 0, 600, true]);
   target.style.display = "none";
 }
 
 function step1() {
   runTestCycle(step2, "Intersecting notification after removing display:none on target.");
-  checkLastEntry(entries, 1, [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, target]);
+  checkLastEntry(entries, 1, [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, false]);
   target.style.display = "";
 }
 
 function step2() {
-  checkLastEntry(entries, 2, [8, 108, 8, 108, 8, 108, 8, 108, 0, 800, 0, 600, target]);
+  checkLastEntry(entries, 2, [8, 108, 8, 108, 8, 108, 8, 108, 0, 800, 0, 600, true]);
 }
 </script>