Preliminary paint property walk implementation for SPv2

third_party/WebKit/Source/core/layout/LayoutTestHelper.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 "config.h"
 #include "core/layout/LayoutTestHelper.h"
 
 #include "core/loader/EmptyClients.h"
 #include "platform/graphics/GraphicsLayer.h"
 #include "platform/graphics/GraphicsLayerFactory.h"
@@ skipping 25 matching lines @@
     fillWithEmptyClients(pageClients);
     DEFINE_STATIC_LOCAL(OwnPtrWillBePersistent<FakeChromeClient>, chromeClient, (FakeChromeClient::create()));
     pageClients.chromeClient = chromeClient.get();
     m_pageHolder = DummyPageHolder::create(IntSize(800, 600), &pageClients, nullptr, settingOverrider());
 
     // This ensures that the minimal DOM tree gets attached
     // correctly for tests that don't call setBodyInnerHTML.
     document().view()->updateAllLifecyclePhases();
 }
 
+void RenderingTest::TearDown()
+{
+    // We need to destroy most of the Blink structure here because derived tests may restore
+    // RuntimeEnabledFeatures setting during teardown, which happens before our destructor
+    // getting invoked, breaking the assumption that REF can't change during Blink lifetime.
+    m_pageHolder = nullptr;
+}
 
 } // namespace blink