Implement NavigationThrottle::BLOCK_REQUEST_AND_COLLAPSE.

third_party/WebKit/Source/core/html/HTMLIFrameElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Simon Hausmann (hausmann@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2006, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Ericsson AB. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 21 matching lines @@
 #include "core/layout/LayoutIFrame.h"
 #include "platform/RuntimeEnabledFeatures.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 inline HTMLIFrameElement::HTMLIFrameElement(Document& document)
     : HTMLFrameElementBase(iframeTag, document),
       m_didLoadNonEmptyDocument(false),
+      m_shouldCollapse(false),
       m_sandbox(HTMLIFrameElementSandbox::create(this)),
       m_referrerPolicy(ReferrerPolicyDefault) {}
 
 DEFINE_NODE_FACTORY(HTMLIFrameElement)
 
 DEFINE_TRACE(HTMLIFrameElement) {
   visitor->trace(m_sandbox);
   visitor->trace(m_permissions);
   HTMLFrameElementBase::trace(visitor);
   Supplementable<HTMLIFrameElement>::trace(visitor);
 }
 
 HTMLIFrameElement::~HTMLIFrameElement() {}
 
+void HTMLIFrameElement::setShouldCollapse(bool collapse) {
+  if (m_shouldCollapse == collapse)
+    return;
+
+  m_shouldCollapse = collapse;
+  if (document().inStyleRecalc())
+    reattachLayoutTree();
+  else
+    lazyReattachIfAttached();
+}
+
 DOMTokenList* HTMLIFrameElement::sandbox() const {
   return m_sandbox.get();
 }
 
 DOMTokenList* HTMLIFrameElement::permissions() const {
   if (!const_cast<HTMLIFrameElement*>(this)->initializePermissionsAttribute())
     return nullptr;
   return m_permissions.get();
 }
 
@@ skipping 81 matching lines @@
     if (m_csp != oldCSP)
       frameOwnerPropertiesChanged();
   } else {
     if (name == srcAttr)
       logUpdateAttributeIfIsolatedWorldAndInDocument("iframe", params);
     HTMLFrameElementBase::parseAttribute(params);
   }
 }
 
 bool HTMLIFrameElement::layoutObjectIsNeeded(const ComputedStyle& style) {
-  return contentFrame() && HTMLElement::layoutObjectIsNeeded(style);
+  return contentFrame() && !m_shouldCollapse &&
+         HTMLFrameElementBase::layoutObjectIsNeeded(style);
 }
 
 LayoutObject* HTMLIFrameElement::createLayoutObject(const ComputedStyle&) {
   return new LayoutIFrame(this);
 }
 
 Node::InsertionNotificationRequest HTMLIFrameElement::insertedInto(
     ContainerNode* insertionPoint) {
   InsertionNotificationRequest result =
       HTMLFrameElementBase::insertedInto(insertionPoint);
@@ skipping 47 matching lines @@
 bool HTMLIFrameElement::initializePermissionsAttribute() {
   if (!RuntimeEnabledFeatures::permissionDelegationEnabled())
     return false;
 
   if (!m_permissions)
     m_permissions = HTMLIFrameElementPermissions::create(this);
   return true;
 }
 
 }  // namespace blink