Add [CEReactions] IDL attributes for Custom Elements V1

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

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  * Copyright (C) 2007, 2010 Apple Inc.  All rights reserved.
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 // https://html.spec.whatwg.org/#the-source-element
 
 interface HTMLSourceElement : HTMLElement {
-    [Reflect, URL] attribute DOMString src;
-    attribute DOMString type;
+    [CEReactions, Reflect, URL] attribute DOMString src;
+    [CEReactions] attribute DOMString type;
 
     // https://html.spec.whatwg.org/#the-source-element-when-used-with-the-picture-element
-    [Reflect] attribute DOMString srcset;
-    [Reflect] attribute DOMString sizes;
-    [Reflect] attribute DOMString media;
+    [CEReactions, Reflect] attribute DOMString srcset;
+    [CEReactions, Reflect] attribute DOMString sizes;
+    [CEReactions, Reflect] attribute DOMString media;
 };