Rename RootScroller class to RootScrollerController.

third_party/WebKit/Source/core/page/scrolling/RootScroller.cpp

Index: third_party/WebKit/Source/core/page/scrolling/RootScroller.cpp
diff --git a/third_party/WebKit/Source/core/page/scrolling/RootScroller.cpp b/third_party/WebKit/Source/core/page/scrolling/RootScroller.cpp
deleted file mode 100644
index 92115c6e187244cba9c00e290d9d7c6247e89140..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/core/page/scrolling/RootScroller.cpp
+++ /dev/null
@@ -1,165 +0,0 @@
-// Copyright 2016 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 "core/page/scrolling/RootScroller.h"
-
-#include "core/dom/Document.h"
-#include "core/dom/Element.h"
-#include "core/frame/FrameHost.h"
-#include "core/frame/FrameView.h"
-#include "core/frame/TopControls.h"
-#include "core/layout/LayoutBox.h"
-#include "core/page/Page.h"
-#include "core/page/scrolling/OverscrollController.h"
-#include "core/page/scrolling/ViewportScrollCallback.h"
-#include "core/paint/PaintLayerScrollableArea.h"
-#include "platform/scroll/ScrollableArea.h"
-
-namespace blink {
-
-namespace {
-
-ScrollableArea* scrollableAreaFor(const Element& element)
-{
-    if (!element.layoutObject() || !element.layoutObject()->isBox())
-        return nullptr;
-
-    LayoutBox* box = toLayoutBox(element.layoutObject());
-
-    if (box->isDocumentElement())
-        return element.document().view()->getScrollableArea();
-
-    return static_cast<PaintInvalidationCapableScrollableArea*>(
-        box->getScrollableArea());
-}
-
-bool fillsViewport(const Element& element)
-{
-    DCHECK(element.layoutObject());
-    DCHECK(element.layoutObject()->isBox());
-
-    LayoutObject* layoutObject = element.layoutObject();
-
-    // TODO(bokan): Broken for OOPIF.
-    Document& topDocument = element.document().topDocument();
-
-    Vector<FloatQuad> quads;
-    layoutObject->absoluteQuads(quads);
-    DCHECK_EQ(quads.size(), 1u);
-
-    if (!quads[0].isRectilinear())
-        return false;
-
-    LayoutRect boundingBox(quads[0].boundingBox());
-
-    return boundingBox.location() == LayoutPoint::zero()
-        && boundingBox.size() == topDocument.layoutViewItem().size();
-}
-
-bool isValidRootScroller(const Element& element)
-{
-    if (!element.layoutObject())
-        return false;
-
-    if (!scrollableAreaFor(element))
-        return false;
-
-    if (!fillsViewport(element))
-        return false;
-
-    return true;
-}
-
-} // namespace
-
-ViewportScrollCallback* RootScroller::createViewportApplyScroll(
-    TopControls& topControls, OverscrollController& overscrollController)
-{
-    return new ViewportScrollCallback(topControls, overscrollController);
-}
-
-RootScroller::RootScroller(Document& document, ViewportScrollCallback* applyScrollCallback)
-    : m_document(&document)
-    , m_viewportApplyScroll(applyScrollCallback)
-{
-}
-
-DEFINE_TRACE(RootScroller)
-{
-    visitor->trace(m_document);
-    visitor->trace(m_viewportApplyScroll);
-    visitor->trace(m_rootScroller);
-    visitor->trace(m_effectiveRootScroller);
-}
-
-void RootScroller::set(Element* newRootScroller)
-{
-    m_rootScroller = newRootScroller;
-    updateEffectiveRootScroller();
-}
-
-Element* RootScroller::get() const
-{
-    return m_rootScroller;
-}
-
-Element* RootScroller::effectiveRootScroller() const
-{
-    return m_effectiveRootScroller;
-}
-
-void RootScroller::didUpdateLayout()
-{
-    updateEffectiveRootScroller();
-}
-
-void RootScroller::updateEffectiveRootScroller()
-{
-    bool rootScrollerValid =
-        m_rootScroller && isValidRootScroller(*m_rootScroller);
-
-    Element* newEffectiveRootScroller = rootScrollerValid
-        ? m_rootScroller.get()
-        : defaultEffectiveRootScroller();
-
-    if (m_effectiveRootScroller == newEffectiveRootScroller)
-        return;
-
-    moveViewportApplyScroll(newEffectiveRootScroller);
-    m_effectiveRootScroller = newEffectiveRootScroller;
-}
-
-void RootScroller::moveViewportApplyScroll(Element* target)
-{
-    if (!m_viewportApplyScroll)
-        return;
-
-    if (m_effectiveRootScroller)
-        m_effectiveRootScroller->removeApplyScroll();
-
-    ScrollableArea* targetScroller =
-        target ? scrollableAreaFor(*target) : nullptr;
-
-    if (targetScroller) {
-        // Use disable-native-scroll since the ViewportScrollCallback needs to
-        // apply scroll actions both before (TopControls) and after (overscroll)
-        // scrolling the element so it will apply scroll to the element itself.
-        target->setApplyScroll(
-            m_viewportApplyScroll,
-            "disable-native-scroll");
-    }
-
-    // Ideally, scroll customization would pass the current element to scroll to
-    // the apply scroll callback but this doesn't happen today so we set it
-    // through a back door here.
-    m_viewportApplyScroll->setScroller(targetScroller);
-}
-
-Element* RootScroller::defaultEffectiveRootScroller()
-{
-    DCHECK(m_document);
-    return m_document->documentElement();
-}
-
-} // namespace blink