Add [CEReactions] IDL attributes for Custom Elements V1

third_party/WebKit/Source/core/html/HTMLVideoElement.idl

Index: third_party/WebKit/Source/core/html/HTMLVideoElement.idl
diff --git a/third_party/WebKit/Source/core/html/HTMLVideoElement.idl b/third_party/WebKit/Source/core/html/HTMLVideoElement.idl
index 351cf13d438a42b620ea1f4160989c04b9c1d3e2..1a29fa90327d615b64f911ee10eec6e5c05ba76e 100644
--- a/third_party/WebKit/Source/core/html/HTMLVideoElement.idl
+++ b/third_party/WebKit/Source/core/html/HTMLVideoElement.idl
@@ -26,11 +26,11 @@
 // https://html.spec.whatwg.org/#the-video-element
 
 interface HTMLVideoElement : HTMLMediaElement {
-    [Reflect] attribute unsigned long width;
-    [Reflect] attribute unsigned long height;
+    [CEReactions, Reflect] attribute unsigned long width;
+    [CEReactions, Reflect] attribute unsigned long height;
     readonly attribute unsigned long videoWidth;
     readonly attribute unsigned long videoHeight;
-    [Reflect, URL] attribute DOMString poster;
+    [CEReactions, Reflect, URL] attribute DOMString poster;
 
     // Non-standard APIs
     [RuntimeEnabled=PrefixedVideoFullscreen, DeprecateAs=PrefixedVideoSupportsFullscreen] readonly attribute boolean webkitSupportsFullscreen;