Rename RootScroller class to RootScrollerController.

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

Index: third_party/WebKit/Source/core/page/scrolling/RootScroller.h
diff --git a/third_party/WebKit/Source/core/page/scrolling/RootScroller.h b/third_party/WebKit/Source/core/page/scrolling/RootScroller.h
deleted file mode 100644
index 516290cf0c18ba7ddbf3856341559754d09bd970..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/core/page/scrolling/RootScroller.h
+++ /dev/null
@@ -1,100 +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.
-
-#ifndef RootScroller_h
-#define RootScroller_h
-
-#include "core/CoreExport.h"
-#include "platform/heap/Handle.h"
-
-namespace blink {
-
-class Document;
-class Element;
-class OverscrollController;
-class TopControls;
-class ViewportScrollCallback;
-
-// Manages the root scroller associated with a given document. The root scroller
-// causes top controls movement, overscroll effects and prevents chaining
-// scrolls up further in the DOM. It can be set from script using
-// document.setRootScroller.
-//
-// There are two notions of a root scroller in this class: m_rootScroller and
-// m_effectiveRootScroller. The former is the Element that was set as the root
-// scroller using document.setRootScroller. If the page didn't set a root
-// scroller this will be nullptr. The "effective" root scroller is the current
-// element we're using internally to apply viewport scroll actions. i.e It's the
-// element with the ViewportScrollCallback set as its apply-scroll callback.
-// The effective root scroller will only be null during document initialization.
-//
-// If the root scroller element is a valid element to become the root scroller,
-// it will be promoted to the effective root scroller. If it is not valid, the
-// effective root scroller will fall back to a default Element (see
-// defaultEffectiveRootScroller()). The rules for what makes an element a valid
-// root scroller are set in isValidRootScroller(). The validity of the current
-// root scroller is re-checked after each layout.
-class CORE_EXPORT RootScroller : public GarbageCollected<RootScroller> {
-public:
-    // Creates a RootScroller for the given document. An optional
-    // ViewportScrollCallback can be provided. If it is, RootScroller will
-    // ensure that the effectiveRootScroller element always has this set as the
-    // apply scroll callback.
-    static RootScroller* create(
-        Document& document,
-        ViewportScrollCallback* applyScrollCallback)
-    {
-        return new RootScroller(document, applyScrollCallback);
-    }
-
-    // Creates an apply scroll callback that handles viewport actions like
-    // TopControls movement and Overscroll.
-    static ViewportScrollCallback* createViewportApplyScroll(
-        TopControls&, OverscrollController&);
-
-    DECLARE_TRACE();
-
-    // Sets the element that will be used as the root scroller. This can be
-    // nullptr, in which case we'll use the default element (documentElement) as
-    // the effective root scroller.
-    void set(Element*);
-
-    // Returns the element currently set as the root scroller from script. This
-    // differs from the effective root scroller since the set Element may not
-    // currently be a valid root scroller. e.g. If the page sets an Element
-    // with `display: none`, get() will return that element, even though the
-    // effective root scroller will remain the element returned by
-    // defaultEffectiveRootScroller().
-    Element* get() const;
-
-    // This returns the Element that's actually being used to control viewport
-    // actions right now. This is different from get() if a root scroller hasn't
-    // been set, or if the set root scroller isn't currently a valid scroller.
-    Element* effectiveRootScroller() const;
-
-    // This class needs to be informed of changes in layout so that it can
-    // determine if the current root scroller is still valid or if it must be
-    // replaced by the defualt root scroller.
-    void didUpdateLayout();
-
-private:
-    RootScroller(Document&, ViewportScrollCallback*);
-
-    Element* defaultEffectiveRootScroller();
-
-    // Ensures the effective root scroller is currently valid and replaces it
-    // with the default if not.
-    void updateEffectiveRootScroller();
-    void moveViewportApplyScroll(Element* target);
-
-    WeakMember<Document> m_document;
-    Member<ViewportScrollCallback> m_viewportApplyScroll;
-
-    WeakMember<Element> m_rootScroller;
-    WeakMember<Element> m_effectiveRootScroller;
-};
-
-} // namespace blink
-
-#endif // RootScroller_h