Added spec links to CSSTransformComponent and StylePropertyMap

third_party/WebKit/Source/core/css/cssom/StylePropertyMap.idl

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// https://drafts.css-houdini.org/css-typed-om/#the-stylepropertymap
 [
     Exposed=(Window,PaintWorklet),
     RuntimeEnabled=CSSTypedOM,
 ] interface StylePropertyMap {
     [RaisesException] void append(DOMString property, (CSSStyleValue or sequence<CSSStyleValue> or DOMString) value);
     [RaisesException, ImplementedAs=remove] void delete(DOMString property);
     [RaisesException] CSSStyleValue? get(DOMString property);
     [RaisesException] sequence<CSSStyleValue> getAll(DOMString property);
     [RaisesException] boolean has(DOMString property);
     [RaisesException] void set(DOMString property, (CSSStyleValue or sequence<CSSStyleValue> or DOMString) value);
     iterable<DOMString, (CSSStyleValue or sequence<CSSStyleValue>)>;
     sequence<DOMString> getProperties();
 };