It is time.

ui/compositor/float_animation_curve_adapter.cc

-// Copyright (c) 2012 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 "ui/compositor/float_animation_curve_adapter.h"
-
-#include "cc/base/time_util.h"
-
-namespace ui {
-
-FloatAnimationCurveAdapter::FloatAnimationCurveAdapter(
-    gfx::Tween::Type tween_type,
-    float initial_value,
-    float target_value,
-    base::TimeDelta duration)
-    : tween_type_(tween_type),
-      initial_value_(initial_value),
-      target_value_(target_value),
-      duration_(duration) {
-}
-
-base::TimeDelta FloatAnimationCurveAdapter::Duration() const {
-  return duration_;
-}
-
-scoped_ptr<cc::AnimationCurve> FloatAnimationCurveAdapter::Clone() const {
-  return make_scoped_ptr(new FloatAnimationCurveAdapter(
-      tween_type_, initial_value_, target_value_, duration_));
-}
-
-float FloatAnimationCurveAdapter::GetValue(base::TimeDelta t) const {
-  if (t >= duration_)
-    return target_value_;
-  if (t <= base::TimeDelta())
-    return initial_value_;
-  double progress = cc::TimeUtil::Divide(t, duration_);
-  return gfx::Tween::FloatValueBetween(
-      gfx::Tween::CalculateValue(tween_type_, progress),
-      initial_value_,
-      target_value_);
-}
-
-}  // namespace ui