Add UseCounter for legacy document.* that returns HTMLCollection.

third_party/WebKit/Source/core/dom/Document.idl

Index: third_party/WebKit/Source/core/dom/Document.idl
diff --git a/third_party/WebKit/Source/core/dom/Document.idl b/third_party/WebKit/Source/core/dom/Document.idl
index b9ee23108dc5d5e0e81f825951992d97d3f9f648..6ddc0c09e1db138606c60d96fa96a1cce161d305 100644
--- a/third_party/WebKit/Source/core/dom/Document.idl
+++ b/third_party/WebKit/Source/core/dom/Document.idl
@@ -103,12 +103,12 @@ interface Document : Node {
     [CustomElementCallbacks] attribute DOMString dir;
     [RaisesException=Setter, CustomElementCallbacks, PerWorldBindings] attribute HTMLElement? body;
     readonly attribute HTMLHeadElement? head;
-    [SameObject] readonly attribute HTMLCollection images;
-    [SameObject] readonly attribute HTMLCollection embeds;
-    [SameObject, ImplementedAs=embeds] readonly attribute HTMLCollection plugins;
-    [SameObject] readonly attribute HTMLCollection links;
-    [SameObject] readonly attribute HTMLCollection forms;
-    [SameObject] readonly attribute HTMLCollection scripts;
+    [SameObject, MeasureAs=DocumentImages] readonly attribute HTMLCollection images;

[philipj_slow, 2016/04/12 09:51:57]

Can you use just [Measure] to get the generated name?

[kochi, 2016/04/12 10:10:53]

Good to know.
Changed to use [Measure] and renamed the counter names accordingly.

+    [SameObject, MeasureAs=DocumentEmbeds] readonly attribute HTMLCollection embeds;
+    [SameObject, ImplementedAs=embeds, MeasureAs=DocumentPlugins] readonly attribute HTMLCollection plugins;
+    [SameObject, MeasureAs=DocumentLinks] readonly attribute HTMLCollection links;
+    [SameObject, MeasureAs=DocumentForms] readonly attribute HTMLCollection forms;
+    [SameObject, MeasureAs=DocumentScripts] readonly attribute HTMLCollection scripts;
     [PerWorldBindings] NodeList getElementsByName(DOMString elementName);
     [ImplementedAs=currentScriptForBinding] readonly attribute HTMLScriptElement? currentScript;
 
@@ -137,8 +137,8 @@ interface Document : Node {
 
     // FIXME: *Color are on HTMLDocument.
 
-    readonly attribute HTMLCollection anchors;
-    readonly attribute HTMLCollection applets;
+    [MeasureAs=DocumentAnchors] readonly attribute HTMLCollection anchors;
+    [MeasureAs=DocumentApplets] readonly attribute HTMLCollection applets;
 
     // FIXME: clear(), captureEvents(), releaseEvents() and all are on HTMLDocument.