Make document.rootScroller into an origin trial

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

 /*
  * Copyright (C) 2006, 2007, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006, 2007 Samuel Weinig <sam@webkit.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 60 matching lines @@
 
     [NewObject, RaisesException, CallWith=ExecutionContext] Event createEvent(DOMString eventType);
 
     [NewObject] Range createRange();
 
     // NodeFilter.SHOW_ALL = 0xFFFFFFFF
     [NewObject] NodeIterator createNodeIterator(Node root, optional unsigned long whatToShow = 0xFFFFFFFF, optional NodeFilter? filter = null);
     [NewObject] TreeWalker createTreeWalker(Node root, optional unsigned long whatToShow = 0xFFFFFFFF, optional NodeFilter? filter = null);
 
     // NonDocumentRootScroller (https://github.com/bokand/NonDocumentRootScroller)
-    [RaisesException=Setter, RuntimeEnabled=SetRootScroller, Measure] attribute Element? rootScroller;
+    [RaisesException=Setter, OriginTrialEnabled=RootScroller, Measure] attribute Element? rootScroller;

[iclelland, 2017/01/12 15:58:13]

You'll also need to add a block in installConditionalFeaturesForModules to add
the property to Document when the trial is enabled (this is the annoying manual
bit that we need to eventually generate).

When it sees a document object, it needs to run the generated
installRootScroller method on the prototype. I haven't checked this code too
carefully, but it should probably look something like:

  if (wrapperTypeInfo == &V8Document::wrapperTypeInfo) {
    if (OriginTrials::rootScrollerEnabled(executionContext)) {
      V8DocumentPartial::installRootScroller(isolate, world,
                                          v8::Local<v8::Object>(),
                                          prototypeObject, interfaceObject);
    }
  }

[bokan, 2017/01/12 16:11:59]

Do you mean in installConditionalFeatures? My feature isn't in a module but in
core.

[iclelland, 2017/01/12 19:26:41]

Yes, I totally mean that :) Sorry -- that's what I meant about not having
checked too closely.

s/V8DocumentPartial/V8Document/ then, as well.

 
     // FIXME: xmlEncoding/xmlVersion/xmlStandalone have been removed from the spec.
     [MeasureAs=DocumentXMLEncoding] readonly attribute DOMString? xmlEncoding;
     [RaisesException=Setter, MeasureAs=DocumentXMLVersion] attribute DOMString? xmlVersion;
     [RaisesException=Setter, MeasureAs=DocumentXMLStandalone] attribute boolean xmlStandalone;
 
     // HTML
     // https://html.spec.whatwg.org/#the-document-object
 
     // resource metadata management
@@ skipping 117 matching lines @@
     [RuntimeEnabled=ExperimentalContentSecurityPolicyFeatures] attribute EventHandler onsecuritypolicyviolation;
     attribute EventHandler onselectionchange;
     attribute EventHandler onselectstart;
     attribute EventHandler onwheel;
 };
 
 Document implements GlobalEventHandlers;
 Document implements ParentNode;
 Document implements NonElementParentNode;
 Document implements DocumentOrShadowRoot;