Add use counters for lots of DOM APIs.

third_party/WebKit/Source/core/dom/shadow/ShadowRoot.idl

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
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 // https://w3c.github.io/webcomponents/spec/shadow/#the-shadowroot-interface
 
 interface ShadowRoot : DocumentFragment {
-    readonly attribute ShadowRootMode mode;
-    readonly attribute Element host;
-    [ImplementedAs=olderShadowRootForBindings] readonly attribute ShadowRoot? olderShadowRoot;
-    [TreatNullAs=NullString, CEReactions, CustomElementCallbacks, RaisesException=Setter] attribute DOMString innerHTML;
-    readonly attribute boolean delegatesFocus;
+    [Measure] readonly attribute ShadowRootMode mode;
+    [Measure] readonly attribute Element host;
+    [Measure, ImplementedAs=olderShadowRootForBindings] readonly attribute ShadowRoot? olderShadowRoot;
+    [Measure, TreatNullAs=NullString, CEReactions, CustomElementCallbacks, RaisesException=Setter] attribute DOMString innerHTML;
+    [Measure] readonly attribute boolean delegatesFocus;
 
     // TODO(foolip): The spec does not override cloneNode() on the ShadowRoot
     // interface. Here, it's used to implement "Invoking the cloneNode() method
     // on a ShadowRoot instance must always throw a DATA_CLONE_ERR exception" as
     // Node.cloneNode() does not have [RaisesException].
-    [RaisesException] Node cloneNode(optional boolean deep = false);
+    [Measure, RaisesException] Node cloneNode(optional boolean deep = false);
 };
 
 ShadowRoot implements DocumentOrShadowRoot;