Move (Resize|Rotation)ViewportAnchor.* from web/ to core/frame/.

third_party/WebKit/Source/web/RotationViewportAnchor.h

-// Copyright 2015 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 RotationViewportAnchor_h
-#define RotationViewportAnchor_h
-
-#include "platform/geometry/FloatSize.h"
-#include "platform/geometry/IntPoint.h"
-#include "platform/geometry/IntRect.h"
-#include "platform/geometry/LayoutRect.h"
-#include "platform/heap/Handle.h"
-
-namespace blink {
-
-class FrameView;
-class Node;
-class PageScaleConstraintsSet;
-class ScrollableArea;
-class VisualViewport;
-
-// The rotation anchor provides a way to anchor a viewport origin to a DOM node.
-// In particular, the user supplies an anchor point (in view coordinates, e.g.,
-// (0, 0) == viewport origin, (0.5, 0) == viewport top center). The anchor point
-// tracks the underlying DOM node; as the node moves or the view is resized, the
-// viewport anchor maintains its orientation relative to the node, and the
-// viewport origin maintains its orientation relative to the anchor. If there is
-// no node or it is lost during the resize, we fall back to the resize anchor
-// logic.
-class RotationViewportAnchor {
-  STACK_ALLOCATED();
-
- public:
-  RotationViewportAnchor(FrameView& root_frame_view,
-                         VisualViewport&,
-                         const FloatSize& anchor_in_inner_view_coords,
-                         PageScaleConstraintsSet&);
-  ~RotationViewportAnchor();
-
- private:
-  void SetAnchor();
-  void RestoreToAnchor();
-
-  FloatPoint GetInnerOrigin(const FloatSize& inner_size) const;
-
-  void ComputeOrigins(const FloatSize& inner_size,
-                      IntPoint& main_frame_offset,
-                      FloatPoint& visual_viewport_offset) const;
-  ScrollableArea& LayoutViewport() const;
-
-  Member<FrameView> root_frame_view_;
-  Member<VisualViewport> visual_viewport_;
-
-  float old_page_scale_factor_;
-  float old_minimum_page_scale_factor_;
-
-  // Inner viewport origin in the reference frame of the document in CSS pixels
-  FloatPoint visual_viewport_in_document_;
-
-  // Inner viewport origin in the reference frame of the outer viewport
-  // normalized to the outer viewport size.
-  FloatSize normalized_visual_viewport_offset_;
-
-  Member<Node> anchor_node_;
-  LayoutRect anchor_node_bounds_;
-
-  FloatSize anchor_in_inner_view_coords_;
-  FloatSize anchor_in_node_coords_;
-
-  PageScaleConstraintsSet& page_scale_constraints_set_;
-};
-
-}  // namespace blink
-
-#endif  // RotationViewportAnchor_h