CC Animation: Fix pauseAnimation so it doesn't reset blink negative delays

cc/test/animation_test_common.cc

 // Copyright 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 "cc/test/animation_test_common.h"
 
 #include "cc/animation/animation_id_provider.h"
 #include "cc/animation/animation_player.h"
 #include "cc/animation/keyframed_animation_curve.h"
 #include "cc/animation/layer_animation_controller.h"
@@ skipping 364 matching lines @@
                               use_timing_function);
 }
 
 int AddAnimatedFilterToPlayer(AnimationPlayer* player,
                               double duration,
                               float start_brightness,
                               float end_brightness) {
   return AddAnimatedFilter(player, duration, start_brightness, end_brightness);
 }
 
+int AddOpacityStepsToController(LayerAnimationController* target,
+                                double duration,
+                                float start_opacity,
+                                float end_opacity,
+                                int num_steps) {
+  scoped_ptr<KeyframedFloatAnimationCurve> curve(
+      KeyframedFloatAnimationCurve::Create());
+
+  scoped_ptr<TimingFunction> func =
+      StepsTimingFunction::Create(num_steps, 0.5f);
+  if (duration > 0.0)
+    curve->AddKeyframe(
+        FloatKeyframe::Create(base::TimeDelta(), start_opacity, func.Pass()));
+  curve->AddKeyframe(FloatKeyframe::Create(
+      base::TimeDelta::FromSecondsD(duration), end_opacity, nullptr));
+
+  int id = AnimationIdProvider::NextAnimationId();
+
+  scoped_ptr<Animation> animation(
+      Animation::Create(curve.Pass(), id, AnimationIdProvider::NextGroupId(),
+                        Animation::OPACITY));
+  animation->set_needs_synchronized_start_time(true);
+
+  target->AddAnimation(animation.Pass());
+  return id;
+}
+
 }  // namespace cc