Support script modify iframe scrolling, marginWidth and marginHeight attr

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
@@ skipping 4292 matching lines @@
 }
 
 HTMLFrameOwnerElement* Document::localOwner() const {
   if (!frame())
     return 0;
   // FIXME: This probably breaks the attempts to layout after a load is finished
   // in implicitClose(), and probably tons of other things...
   return frame()->deprecatedLocalOwner();
 }
 
+void Document::didChangeFrameOwnerProperties(WTF::Optional<int> marginWidth,
+                                             WTF::Optional<int> marginHeight,

[bokan, 2016/11/21 13:21:52]

Rather than using Optionals here, always pass in the current  values. You can
then compare them to the frame owner's value to see if you need to set/do
layout.

+                                             bool scrollingModeChanged) {
+  if (marginWidth)
+    body()->setIntegralAttribute(marginwidthAttr, marginWidth.value());
+  if (marginHeight)
+    body()->setIntegralAttribute(marginheightAttr, marginHeight.value());
+  if (scrollingModeChanged)
+    view()->setNeedsLayout();
+}
+
 bool Document::isInInvisibleSubframe() const {
   if (!localOwner())
     return false;  // this is a local root element
 
   // TODO(bokan): This looks like it doesn't work in OOPIF.
   DCHECK(frame());
   return frame()->ownerLayoutItem().isNull();
 }
 
 String Document::cookie(ExceptionState& exceptionState) const {
@@ skipping 2117 matching lines @@
 }
 
 void showLiveDocumentInstances() {
   WeakDocumentSet& set = liveDocumentSet();
   fprintf(stderr, "There are %u documents currently alive:\n", set.size());
   for (Document* document : set)
     fprintf(stderr, "- Document %p URL: %s\n", document,
             document->url().getString().utf8().data());
 }
 #endif