Update layout before creating AXObjectCache in AccessibilityInspectorAgent

third_party/WebKit/Source/modules/accessibility/InspectorAccessibilityAgent.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/accessibility/InspectorAccessibilityAgent.h"
 
 #include "core/HTMLNames.h"
 #include "core/dom/AXObjectCache.h"
 #include "core/dom/DOMNodeIds.h"
 #include "core/dom/Element.h"
@@ skipping 363 matching lines @@
 
     if (!m_domAgent->enabled()) {
         *errorString = "DOM agent must be enabled";
         return;
     }
     Node* node = m_domAgent->assertNode(errorString, nodeId);
     if (!node)
         return;
 
     Document& document = node->document();
+    document.updateStyleAndLayoutIgnorePendingStylesheets();
+    DocumentLifecycle::DisallowTransitionScope disallowTransition(document.lifecycle());
     std::unique_ptr<ScopedAXObjectCache> cache = ScopedAXObjectCache::create(document);
     AXObjectCacheImpl* cacheImpl = toAXObjectCacheImpl(cache->get());
     AXObject* axObject = cacheImpl->getOrCreate(node);
     if (!axObject || axObject->accessibilityIsIgnored()) {
         *accessibilityNode = buildObjectForIgnoredNode(node, axObject, cacheImpl);
         return;
     }
 
     std::unique_ptr<protocol::Array<AXProperty>> properties = protocol::Array<AXProperty>::create();
     fillLiveRegionProperties(axObject, properties.get());
     fillGlobalStates(axObject, properties.get());
     fillWidgetProperties(axObject, properties.get());
     fillWidgetStates(axObject, properties.get());
     fillRelationships(axObject, properties.get());
 
     *accessibilityNode = buildObjectForNode(node, axObject, cacheImpl, std::move(properties));
 }
 
 DEFINE_TRACE(InspectorAccessibilityAgent)
 {
     visitor->trace(m_page);
     visitor->trace(m_domAgent);
     InspectorBaseAgent::trace(visitor);
 }
 
 } // namespace blink