It is time.

ui/compositor/transform_animation_curve_adapter_unittest.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 "ui/compositor/transform_animation_curve_adapter.h"
-
-#include <sstream>
-
-#include "base/time/time.h"
-#include "testing/gtest/include/gtest/gtest.h"
-#include "ui/compositor/test/test_utils.h"
-
-namespace ui {
-
-namespace {
-
-// Check that the inverse transform curve gives the gives a transform that when
-// applied on top of the parent transform gives the original transform
-TEST(InverseTransformCurveAdapterTest, InversesTransform) {
-  gfx::Transform parent_start, parent_target;
-  parent_start.Scale(0.5, 3.0);
-  parent_start.Translate(-20.0, 30.0);
-  parent_target.Translate(0, 100);
-
-  gfx::Transform child_transform;
-  child_transform.Rotate(-30.0);
-
-  base::TimeDelta duration = base::TimeDelta::FromSeconds(1);
-
-  const gfx::Transform effective_child_transform =
-      parent_start * child_transform;
-
-  TransformAnimationCurveAdapter parent_curve(gfx::Tween::LINEAR,
-                                              parent_start,
-                                              parent_target,
-                                              duration);
-
-  InverseTransformCurveAdapter child_curve(parent_curve,
-                                           child_transform,
-                                           duration);
-  static const int kSteps = 1000;
-  double step = 1.0 / kSteps;
-  for (int i = 0; i <= kSteps ; ++i) {
-    std::ostringstream message;
-    message << "Step " << i << " of " << kSteps;
-    SCOPED_TRACE(message.str());
-    gfx::Transform progress_parent_transform =
-            parent_curve.GetValue(i*step);
-    gfx::Transform progress_child_transform =
-            child_curve.GetValue(i*step);
-    CheckApproximatelyEqual(effective_child_transform,
-                            progress_parent_transform *
-                            progress_child_transform);
-  }
-}
-
-} // namespace
-
-} // namespace ui