Remove parts of //cc we aren't using

cc/animation/scroll_offset_animation_curve.cc

-// Copyright 2013 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 "cc/animation/scroll_offset_animation_curve.h"
-
-#include <algorithm>
-#include <cmath>
-
-#include "base/logging.h"
-#include "cc/animation/timing_function.h"
-#include "cc/base/time_util.h"
-#include "ui/gfx/animation/tween.h"
-
-const double kDurationDivisor = 60.0;
-
-namespace cc {
-
-namespace {
-
-static float MaximumDimension(gfx::Vector2dF delta) {
-  return std::max(std::abs(delta.x()), std::abs(delta.y()));
-}
-
-static base::TimeDelta DurationFromDelta(gfx::Vector2dF delta) {
-  // The duration of a scroll animation depends on the size of the scroll.
-  // The exact relationship between the size and the duration isn't specified
-  // by the CSSOM View smooth scroll spec and is instead left up to user agents
-  // to decide. The calculation performed here will very likely be further
-  // tweaked before the smooth scroll API ships.
-  return base::TimeDelta::FromMicroseconds(
-      (std::sqrt(MaximumDimension(delta)) / kDurationDivisor) *
-      base::Time::kMicrosecondsPerSecond);
-}
-
-static scoped_ptr<TimingFunction> EaseOutWithInitialVelocity(double velocity) {
-  // Based on EaseInOutTimingFunction::Create with first control point rotated.
-  const double r2 = 0.42 * 0.42;
-  const double v2 = velocity * velocity;
-  const double x1 = std::sqrt(r2 / (v2 + 1));
-  const double y1 = std::sqrt(r2 * v2 / (v2 + 1));
-  return CubicBezierTimingFunction::Create(x1, y1, 0.58, 1);
-}
-
-}  // namespace
-
-scoped_ptr<ScrollOffsetAnimationCurve> ScrollOffsetAnimationCurve::Create(
-    const gfx::ScrollOffset& target_value,
-    scoped_ptr<TimingFunction> timing_function) {
-  return make_scoped_ptr(
-      new ScrollOffsetAnimationCurve(target_value, timing_function.Pass()));
-}
-
-ScrollOffsetAnimationCurve::ScrollOffsetAnimationCurve(
-    const gfx::ScrollOffset& target_value,
-    scoped_ptr<TimingFunction> timing_function)
-    : target_value_(target_value), timing_function_(timing_function.Pass()) {
-}
-
-ScrollOffsetAnimationCurve::~ScrollOffsetAnimationCurve() {}
-
-void ScrollOffsetAnimationCurve::SetInitialValue(
-    const gfx::ScrollOffset& initial_value) {
-  initial_value_ = initial_value;
-  total_animation_duration_ = DurationFromDelta(
-      target_value_.DeltaFrom(initial_value_));
-}
-
-gfx::ScrollOffset ScrollOffsetAnimationCurve::GetValue(
-    base::TimeDelta t) const {
-  base::TimeDelta duration = total_animation_duration_ - last_retarget_;
-  t -= last_retarget_;
-
-  if (t <= base::TimeDelta())
-    return initial_value_;
-
-  if (t >= duration)
-    return target_value_;
-
-  double progress = timing_function_->GetValue(TimeUtil::Divide(t, duration));
-  return gfx::ScrollOffset(
-      gfx::Tween::FloatValueBetween(
-          progress, initial_value_.x(), target_value_.x()),
-      gfx::Tween::FloatValueBetween(
-          progress, initial_value_.y(), target_value_.y()));
-}
-
-base::TimeDelta ScrollOffsetAnimationCurve::Duration() const {
-  return total_animation_duration_;
-}
-
-AnimationCurve::CurveType ScrollOffsetAnimationCurve::Type() const {
-  return SCROLL_OFFSET;
-}
-
-scoped_ptr<AnimationCurve> ScrollOffsetAnimationCurve::Clone() const {
-  scoped_ptr<TimingFunction> timing_function(
-      static_cast<TimingFunction*>(timing_function_->Clone().release()));
-  scoped_ptr<ScrollOffsetAnimationCurve> curve_clone =
-      Create(target_value_, timing_function.Pass());
-  curve_clone->initial_value_ = initial_value_;
-  curve_clone->total_animation_duration_ = total_animation_duration_;
-  curve_clone->last_retarget_ = last_retarget_;
-  return curve_clone.Pass();
-}
-
-void ScrollOffsetAnimationCurve::UpdateTarget(
-    double t,
-    const gfx::ScrollOffset& new_target) {
-  gfx::ScrollOffset current_position =
-      GetValue(base::TimeDelta::FromSecondsD(t));
-  gfx::Vector2dF old_delta = target_value_.DeltaFrom(initial_value_);
-  gfx::Vector2dF new_delta = new_target.DeltaFrom(current_position);
-
-  double old_duration =
-      (total_animation_duration_ - last_retarget_).InSecondsF();
-  double new_duration = DurationFromDelta(new_delta).InSecondsF();
-
-  double old_velocity = timing_function_->Velocity(
-      (t - last_retarget_.InSecondsF()) / old_duration);
-
-  // TimingFunction::Velocity gives the slope of the curve from 0 to 1.
-  // To match the "true" velocity in px/sec we must adjust this slope for
-  // differences in duration and scroll delta between old and new curves.
-  double new_velocity =
-      old_velocity * (new_duration / old_duration) *
-      (MaximumDimension(old_delta) / MaximumDimension(new_delta));
-
-  initial_value_ = current_position;
-  target_value_ = new_target;
-  total_animation_duration_ = base::TimeDelta::FromSecondsD(t + new_duration);
-  last_retarget_ = base::TimeDelta::FromSecondsD(t);
-  timing_function_ = EaseOutWithInitialVelocity(new_velocity);
-}
-
-}  // namespace cc