IntersectionObserver: use an idle callback to send notifications.

third_party/WebKit/LayoutTests/LeakExpectations

Index: third_party/WebKit/LayoutTests/LeakExpectations
diff --git a/third_party/WebKit/LayoutTests/LeakExpectations b/third_party/WebKit/LayoutTests/LeakExpectations
index 526955bed44e16f3e620790e0690a0eb1b0038cd..f730a96caa9644945f9a0c9afb9f4c5ec21e95a7 100644
--- a/third_party/WebKit/LayoutTests/LeakExpectations
+++ b/third_party/WebKit/LayoutTests/LeakExpectations
@@ -152,3 +152,18 @@ crbug.com/594309 [ Linux ] imported/csswg-test/vendor-imports/mozilla/mozilla-ce
 crbug.com/594309 [ Linux ] imported/csswg-test/vendor-imports/mozilla/mozilla-central-reftests/variables/variable-declaration-16.html [ Leak ]
 crbug.com/594309 [ Linux ] imported/csswg-test/vendor-imports/mozilla/mozilla-central-reftests/variables/variable-declaration-17.html [ Leak ]
 crbug.com/594309 [ Linux ] imported/csswg-test/vendor-imports/mozilla/mozilla-central-reftests/variables/variable-declaration-18.html [ Leak ]
+
+
+# -----------------------------------------------------------------
+# Leaks in ScriptedIdleTaskController
+# -----------------------------------------------------------------
+crbug.com/595155 http/tests/intersection-observer/iframe-cross-origin.html [ Leak ]
+crbug.com/595155 intersection-observer/containing-block.html [ Leak ]
+crbug.com/595155 intersection-observer/iframe-no-root.html [ Leak ]
+crbug.com/595155 intersection-observer/multiple-thresholds.html [ Leak ]
+crbug.com/595155 intersection-observer/observer-without-js-reference.html [ Leak ]
+crbug.com/595155 intersection-observer/root-margin.html [ Leak ]
+crbug.com/595155 intersection-observer/same-document-no-root.html [ Leak ]
+crbug.com/595155 intersection-observer/same-document-root.html [ Leak ]
+crbug.com/595155 intersection-observer/same-document-zero-size-target.html [ Leak ]
+crbug.com/595155 intersection-observer/timestamp.html [ Leak ]