[CRD iOS] Move UI stuff into a subdirectory

remoting/client/fling_animation.h

-// Copyright 2017 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 REMOTING_CLIENT_FLING_ANIMATION_H_
-#define REMOTING_CLIENT_FLING_ANIMATION_H_
-
-#include <memory>
-
-#include "base/callback.h"
-#include "base/time/tick_clock.h"
-#include "remoting/client/fling_tracker.h"
-
-namespace remoting {
-
-// This class helps interpolating the positions of an object with the given
-// initial velocity and feeds the change in position back to the callback.
-class FlingAnimation {
- public:
-  // arguments are delta_x and delta_y with respect to the positions at previous
-  // tick.
-  using FlingCallback = base::Callback<void(float, float)>;
-
-  FlingAnimation(float time_constant, const FlingCallback& fling_callback);
-  ~FlingAnimation();
-
-  // (Re)starts the fling animation with the given initial velocity.
-  void SetVelocity(float velocity_x, float velocity_y);
-
-  bool IsAnimationInProgress() const;
-
-  // Moves forward the animation to catch up with current time. Calls the fling
-  // callback with the new positions. No-op if fling animation is not in
-  // progress.
-  void Tick();
-
-  // Aborts the animation.
-  void Abort();
-
-  void SetTickClockForTest(std::unique_ptr<base::TickClock> clock);
-
- private:
-  FlingTracker fling_tracker_;
-  FlingCallback fling_callback_;
-
-  base::TimeTicks fling_start_time_;
-
-  std::unique_ptr<base::TickClock> clock_;
-
-  // FlingAnimation is neither copyable nor movable.
-  FlingAnimation(const FlingAnimation&) = delete;
-  FlingAnimation& operator=(const FlingAnimation&) = delete;
-};
-
-}  // namespace remoting
-#endif  // REMOTING_CLIENT_FLING_ANIMATION_H_