IntersectionObserver: second cut.

third_party/WebKit/Source/core/dom/IntersectionObserverInit.idl

Index: third_party/WebKit/Source/core/dom/IntersectionObserverInit.idl
diff --git a/ui/gfx/vector_icons/window_control_minimize.1x.icon b/third_party/WebKit/Source/core/dom/IntersectionObserverInit.idl
similarity index 54%
copy from ui/gfx/vector_icons/window_control_minimize.1x.icon
copy to third_party/WebKit/Source/core/dom/IntersectionObserverInit.idl
index da77c26839a9572679fb268cddb6fd91a94e218d..4adfc4039cdd4f6de60fffb033ea675f585e6ab6 100644
--- a/ui/gfx/vector_icons/window_control_minimize.1x.icon
+++ b/third_party/WebKit/Source/core/dom/IntersectionObserverInit.idl
@@ -2,10 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-CANVAS_DIMENSIONS, 12,
-MOVE_TO, 1, 9,
-R_H_LINE_TO, 10,
-R_V_LINE_TO, 2,
-H_LINE_TO, 1,
-CLOSE,
-END
+// TODO(szager): link to final spec
+
+dictionary IntersectionObserverInit {
+    Element? root;
+    (double or double[]) threshold = 0;
+};