Add use counters for lots of DOM APIs.

third_party/WebKit/Source/core/timing/PerformanceEntry.idl

Index: third_party/WebKit/Source/core/timing/PerformanceEntry.idl
diff --git a/third_party/WebKit/Source/core/timing/PerformanceEntry.idl b/third_party/WebKit/Source/core/timing/PerformanceEntry.idl
index ce32892cba66398b59df47044953b5034adf58c1..dae4db6f14180eb8e33332004648bd0588904b04 100644
--- a/third_party/WebKit/Source/core/timing/PerformanceEntry.idl
+++ b/third_party/WebKit/Source/core/timing/PerformanceEntry.idl
@@ -32,9 +32,9 @@
 
 // TODO(foolip): Exposed=(Window,Worker)
 interface PerformanceEntry {
-    readonly attribute DOMString name;
-    readonly attribute DOMString entryType;
-    readonly attribute DOMHighResTimeStamp startTime;
-    readonly attribute DOMHighResTimeStamp duration;
+    [Measure] readonly attribute DOMString name;
+    [Measure] readonly attribute DOMString entryType;
+    [Measure] readonly attribute DOMHighResTimeStamp startTime;
+    [Measure] readonly attribute DOMHighResTimeStamp duration;
     serializer = {attribute};
 };