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diff --git a/mash/wm/frame/move_loop.h b/mash/wm/frame/move_loop.h
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+++ b/mash/wm/frame/move_loop.h
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+// 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 MASH_WM_FRAME_MOVE_LOOP_H_
+#define MASH_WM_FRAME_MOVE_LOOP_H_
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "components/mus/public/cpp/window_observer.h"
+#include "components/mus/public/interfaces/input_events.mojom.h"
+#include "ui/gfx/geometry/point.h"
+#include "ui/gfx/geometry/rect.h"
+
+namespace mash {
+namespace wm {
+
+// MoveLoop is responsible for moving/resizing windows.
+class MoveLoop : public mus::WindowObserver {
+ public:
+  enum MoveResult {
+    // The move is still ongoing.
+    CONTINUE,
+
+    // The move is done and the MoveLoop should be destroyed.
+    DONE,
+  };
+
+  enum class HorizontalLocation {
+    LEFT,
+    RIGHT,
+    OTHER,
+  };
+
+  enum class VerticalLocation {
+    TOP,
+    BOTTOM,
+    OTHER,
+  };
+
+  // Number of pixels in which a resize is triggered.
+  static const int kResizeSize = 8;
+
+  ~MoveLoop() override;
+
+  // If a move/resize loop should occur for the specified parameters creates
+  // and returns a new MoveLoop. All events should be funneled to the MoveLoop
+  // until done (Move()).
+  static scoped_ptr<MoveLoop> Create(mus::Window* target,
+                                     const mus::mojom::Event& event);
+
+  // Processes an event for a move/resize loop.
+  MoveResult Move(const mus::mojom::Event& event);
+
+ private:
+  enum class Type {
+    MOVE,
+    RESIZE,
+  };
+
+  MoveLoop(mus::Window* target,
+           const mus::mojom::Event& event,
+           Type type,
+           HorizontalLocation h_loc,
+           VerticalLocation v_loc);
+
+  static void DetermineType(mus::Window* target,
+                            const gfx::Point& location,
+                            Type* type,
+                            HorizontalLocation* h_loc,
+                            VerticalLocation* v_loc);
+
+  // Does the actual move/resize.
+  void MoveImpl(const mus::mojom::Event& event);
+
+  // Cancels the loop. This sets |target_| to null and removes the observer.
+  // After this the MoveLoop is still ongoing and won't stop until the
+  // appropriate event is received.
+  void Cancel();
+
+  void Revert();
+
+  gfx::Rect DetermineBoundsFromDelta(const gfx::Vector2d& delta);
+
+  // mus::WindowObserver:
+  void OnTreeChanged(const TreeChangeParams& params) override;
+  void OnWindowBoundsChanged(mus::Window* window,
+                             const gfx::Rect& old_bounds,
+                             const gfx::Rect& new_bounds) override;
+  void OnWindowVisibilityChanged(mus::Window* window) override;
+
+  // The window this MoveLoop is acting on. |target_| is set to null if the
+  // window unexpectedly changes while the move is in progress.
+  mus::Window* target_;
+
+  const Type type_;
+  const HorizontalLocation h_loc_;
+  const VerticalLocation v_loc_;
+
+  // The id of the pointer that triggered the move.
+  const int32_t pointer_id_;
+
+  // Location of the event (in screen coordinates) that triggered the move.
+  const gfx::Point initial_event_screen_location_;
+
+  // Original bounds of the window.
+  const gfx::Rect initial_window_bounds_;
+
+  const gfx::Rect initial_user_set_bounds_;
+
+  // Set to true when MoveLoop changes the bounds of |target_|. The move is
+  // canceled if the bounds change unexpectedly during the move.
+  bool changing_bounds_;
+
+  DISALLOW_COPY_AND_ASSIGN(MoveLoop);
+};
+
+}  // namespace wm
+}  // namespace mash
+
+#endif  // MASH_WM_FRAME_MOVE_LOOP_H_