Add use counters for lots of DOM APIs.

third_party/WebKit/Source/core/html/track/vtt/VTTRegion.idl

Index: third_party/WebKit/Source/core/html/track/vtt/VTTRegion.idl
diff --git a/third_party/WebKit/Source/core/html/track/vtt/VTTRegion.idl b/third_party/WebKit/Source/core/html/track/vtt/VTTRegion.idl
index 172523b4cc957b62bd1054e670c30aa7c5146b14..37c545437b1b2cb80719baf00b89c9ab35784c61 100644
--- a/third_party/WebKit/Source/core/html/track/vtt/VTTRegion.idl
+++ b/third_party/WebKit/Source/core/html/track/vtt/VTTRegion.idl
@@ -29,18 +29,18 @@
     Constructor,
     RuntimeEnabled=WebVTTRegions,
 ] interface VTTRegion {
-    [RaisesException=Setter] attribute double width;
+  [Measure, RaisesException=Setter] attribute double width;
     // TODO(foolip): height should be called lines.
-    [RaisesException=Setter] attribute long height;
-    [RaisesException=Setter] attribute double regionAnchorX;
-    [RaisesException=Setter] attribute double regionAnchorY;
-    [RaisesException=Setter] attribute double viewportAnchorX;
-    [RaisesException=Setter] attribute double viewportAnchorY;
+  [Measure, RaisesException=Setter] attribute long height;
+  [Measure, RaisesException=Setter] attribute double regionAnchorX;
+  [Measure, RaisesException=Setter] attribute double regionAnchorY;
+  [Measure, RaisesException=Setter] attribute double viewportAnchorX;
+  [Measure, RaisesException=Setter] attribute double viewportAnchorY;
     // TODO(philip): scroll should be of type ScrollSetting.
-    [RaisesException=Setter] attribute DOMString scroll;
+  [Measure, RaisesException=Setter] attribute DOMString scroll;
 
     // TODO(foolip): The track/id attributes are gone from the spec:
     // https://www.w3.org/Bugs/Public/show_bug.cgi?id=24380
-    readonly attribute TextTrack track;
-    attribute DOMString id;
+    [Measure] readonly attribute TextTrack track;
+    [Measure] attribute DOMString id;
 };