Reland: Fix incorrect sign in scroll and content box offset in absoluteToLocalPoint.

third_party/WebKit/Source/core/layout/LayoutTestHelper.h

 // 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.
 
 #ifndef LayoutTestHelper_h
 #define LayoutTestHelper_h
 
 #include "core/dom/Document.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
@@ skipping 20 matching lines @@
 
     Document& document() const { return m_pageHolder->document(); }
 
     // Both sets the inner html and runs the document lifecycle.
     void setBodyInnerHTML(const String& htmlContent)
     {
         document().body()->setInnerHTML(htmlContent, ASSERT_NO_EXCEPTION);
         document().view()->updateAllLifecyclePhases();
     }
 
+    // Returns the Document for the iframe.
+    Document& setupChildIframe(const AtomicString& iframeElementId, const String& htmlContentOfIframe);
+
     // Both enables compositing and runs the document lifecycle.
     void enableCompositing()
     {
         m_pageHolder->page().settings().setAcceleratedCompositingEnabled(true);
         document().view()->updateAllLifecyclePhases();
     }
 
 private:
+    RefPtrWillBePersistent<LocalFrame> m_subframe;
+    OwnPtrWillBePersistent<FrameLoaderClient> m_frameLoaderClient;
     OwnPtr<DummyPageHolder> m_pageHolder;
 };
 
 class SingleChildFrameLoaderClient final : public EmptyFrameLoaderClient {
 public:
     static PassOwnPtrWillBeRawPtr<SingleChildFrameLoaderClient> create() { return adoptPtrWillBeNoop(new SingleChildFrameLoaderClient); }
 
     DEFINE_INLINE_VIRTUAL_TRACE()
     {
         visitor->trace(m_child);
@@ skipping 28 matching lines @@
 
 private:
     explicit FrameLoaderClientWithParent(Frame* parent) : m_parent(parent) { }
 
     RefPtrWillBeMember<Frame> m_parent;
 };
 
 } // namespace blink
 
 #endif // LayoutTestHelper_h