Fix paint code so that overlays and views paint their own layers.

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/frame/FrameHost.h"
 #include "core/html/HTMLIFrameElement.h"
 #include "platform/graphics/test/FakeGraphicsLayerFactory.h"
+#include "platform/scroll/ScrollbarTheme.h"
 
 namespace blink {
 
 namespace {
 
 class FakeChromeClient : public EmptyChromeClient {
 public:
     static PassOwnPtrWillBeRawPtr<FakeChromeClient> create() { return adoptPtrWillBeNoop(new FakeChromeClient); }
 
     GraphicsLayerFactory* graphicsLayerFactory() const override
     {
         return FakeGraphicsLayerFactory::instance();
     }
 };
 
 } // namespace
 
 RenderingTest::RenderingTest(PassOwnPtrWillBeRawPtr<FrameLoaderClient> frameLoaderClient)
 {
     Page::PageClients pageClients;
     fillWithEmptyClients(pageClients);
     DEFINE_STATIC_LOCAL(OwnPtrWillBePersistent<FakeChromeClient>, chromeClient, (FakeChromeClient::create()));
     pageClients.chromeClient = chromeClient.get();
     m_pageHolder = DummyPageHolder::create(IntSize(800, 600), &pageClients, frameLoaderClient, settingOverrider());
+
+    Settings::setMockScrollbarsEnabled(true);
+    RuntimeEnabledFeatures::setOverlayScrollbarsEnabled(true);
+    EXPECT_TRUE(ScrollbarTheme::theme().usesOverlayScrollbars());
 }
 
 void RenderingTest::SetUp()
 {
     // This ensures that the minimal DOM tree gets attached
     // correctly for tests that don't call setBodyInnerHTML.
     document().view()->updateAllLifecyclePhases();
 }
 
 void RenderingTest::TearDown()
@@ skipping 21 matching lines @@
     static_cast<SingleChildFrameLoaderClient*>(document().frame()->client())->setChild(m_subframe.get());
     document().frame()->host()->incrementSubframeCount();
     Document& frameDocument = *iframe.contentDocument();
 
     frameDocument.setBaseURLOverride(KURL(ParsedURLString, "http://test.com"));
     frameDocument.body()->setInnerHTML(htmlContentOfIframe, ASSERT_NO_EXCEPTION);
     return frameDocument;
 }
 
 } // namespace blink