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

cc/test/animation_test_common.h

 // 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.
 
 #ifndef CC_TEST_ANIMATION_TEST_COMMON_H_
 #define CC_TEST_ANIMATION_TEST_COMMON_H_
 
 #include "cc/animation/animation.h"
 #include "cc/animation/animation_curve.h"
 #include "cc/animation/layer_animation_controller.h"
@@ skipping 178 matching lines @@
                                  double duration,
                                  float start_opacity,
                                  float end_opacity,
                                  bool use_timing_function);
 
 int AddAnimatedFilterToPlayer(AnimationPlayer* player,
                               double duration,
                               float start_brightness,
                               float end_brightness);
 
+int AddOpacityStepsToController(LayerAnimationController* target,
+                                double duration,
+                                float start_opacity,
+                                float end_opacity,
+                                int num_steps);
+
 }  // namespace cc
 
 #endif  // CC_TEST_ANIMATION_TEST_COMMON_H_