Add use counters for lots of DOM APIs.

third_party/WebKit/Source/core/events/InputEvent.idl

Index: third_party/WebKit/Source/core/events/InputEvent.idl
diff --git a/third_party/WebKit/Source/core/events/InputEvent.idl b/third_party/WebKit/Source/core/events/InputEvent.idl
index 4fc702ca4b184facb7eb3ec62910834ef261f671..0832c260e211af47cd44e6b7ee59c477a71b3ffd 100644
--- a/third_party/WebKit/Source/core/events/InputEvent.idl
+++ b/third_party/WebKit/Source/core/events/InputEvent.idl
@@ -10,9 +10,9 @@
     Constructor(DOMString type, optional InputEventInit eventInitDict),
     RuntimeEnabled=InputEvent,
 ] interface InputEvent : UIEvent {
-    readonly attribute DOMString inputType;
-    readonly attribute DOMString? data;
-    readonly attribute DataTransfer? dataTransfer;
-    readonly attribute boolean isComposing;
-    sequence<StaticRange> getTargetRanges();
+    [Measure] readonly attribute DOMString inputType;
+    [Measure] readonly attribute DOMString? data;
+    [Measure] readonly attribute DataTransfer? dataTransfer;
+    [Measure] readonly attribute boolean isComposing;
+    [Measure] sequence<StaticRange> getTargetRanges();
 };