Add use counters for lots of DOM APIs.

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

Index: third_party/WebKit/Source/core/html/HTMLSourceElement.idl
diff --git a/third_party/WebKit/Source/core/html/HTMLSourceElement.idl b/third_party/WebKit/Source/core/html/HTMLSourceElement.idl
index 5a7882a7e36bb6f6812241f784497abdc7f9dc45..aa739bdd53e1ba49a859d2cf4b98555356ac9e7b 100644
--- a/third_party/WebKit/Source/core/html/HTMLSourceElement.idl
+++ b/third_party/WebKit/Source/core/html/HTMLSourceElement.idl
@@ -26,11 +26,11 @@
 // https://html.spec.whatwg.org/#the-source-element
 
 interface HTMLSourceElement : HTMLElement {
-    [CEReactions, Reflect, URL] attribute DOMString src;
-    [CEReactions] attribute DOMString type;
+  [Measure, CEReactions, Reflect, URL] attribute DOMString src;
+  [Measure, CEReactions] attribute DOMString type;
 
     // https://html.spec.whatwg.org/#the-source-element-when-used-with-the-picture-element
-    [CEReactions, Reflect] attribute DOMString srcset;
-    [CEReactions, Reflect] attribute DOMString sizes;
-    [CEReactions, Reflect] attribute DOMString media;
+  [Measure, CEReactions, Reflect] attribute DOMString srcset;
+  [Measure, CEReactions, Reflect] attribute DOMString sizes;
+  [Measure, CEReactions, Reflect] attribute DOMString media;
 };