Web Animations: Simplify mutable AnimationTimeline currentTime and playbackRate

Source/core/animation/AnimationTimelineTest.cpp

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 193 matching lines @@
     document->animationClock().updateTime(200);
     EXPECT_EQ(zeroTime, timeline->zeroTime());
     EXPECT_EQ(200, timeline->currentTimeInternal());
     EXPECT_EQ(200, timeline->currentTimeInternal(isNull));
     EXPECT_FALSE(isNull);
 }
 
 TEST_F(AnimationAnimationTimelineTest, PlaybackRatePause)
 {
     timeline = AnimationTimeline::create(document.get());
-    double zeroTime = timeline->zeroTime();
     bool isNull;
 
     document->animationClock().updateTime(100);
-    EXPECT_EQ(zeroTime, timeline->zeroTime());
+    EXPECT_EQ(0, timeline->zeroTime());
     EXPECT_EQ(100, timeline->currentTimeInternal());
     EXPECT_EQ(100, timeline->currentTimeInternal(isNull));
     EXPECT_FALSE(isNull);
 
     timeline->setPlaybackRate(0.0);
     EXPECT_EQ(0.0, timeline->playbackRate());
     document->animationClock().updateTime(200);
-    EXPECT_EQ(zeroTime, timeline->zeroTime());
+    EXPECT_EQ(100, timeline->zeroTime());
     EXPECT_EQ(100, timeline->currentTimeInternal());
     EXPECT_EQ(100, timeline->currentTimeInternal(isNull));
 
     timeline->setPlaybackRate(1.0);
     EXPECT_EQ(1.0, timeline->playbackRate());
     document->animationClock().updateTime(400);
-    EXPECT_EQ(zeroTime + 100, timeline->zeroTime());
+    EXPECT_EQ(100, timeline->zeroTime());
     EXPECT_EQ(300, timeline->currentTimeInternal());
     EXPECT_EQ(300, timeline->currentTimeInternal(isNull));
 
     EXPECT_FALSE(isNull);
 }
 
 TEST_F(AnimationAnimationTimelineTest, PlaybackRateSlow)
 {
     timeline = AnimationTimeline::create(document.get());
-    double zeroTime = timeline->zeroTime();
     bool isNull;
 
     document->animationClock().updateTime(100);
-    EXPECT_EQ(zeroTime, timeline->zeroTime());
+    EXPECT_EQ(0, timeline->zeroTime());
     EXPECT_EQ(100, timeline->currentTimeInternal());
     EXPECT_EQ(100, timeline->currentTimeInternal(isNull));
     EXPECT_FALSE(isNull);
 
     timeline->setPlaybackRate(0.5);
     EXPECT_EQ(0.5, timeline->playbackRate());
     document->animationClock().updateTime(300);
-    EXPECT_EQ(zeroTime, timeline->zeroTime());
+    EXPECT_EQ(-100, timeline->zeroTime());
     EXPECT_EQ(200, timeline->currentTimeInternal());
     EXPECT_EQ(200, timeline->currentTimeInternal(isNull));
 
     timeline->setPlaybackRate(1.0);
     EXPECT_EQ(1.0, timeline->playbackRate());
     document->animationClock().updateTime(400);
-    EXPECT_EQ(zeroTime + 100, timeline->zeroTime());
+    EXPECT_EQ(100, timeline->zeroTime());
     EXPECT_EQ(300, timeline->currentTimeInternal());
     EXPECT_EQ(300, timeline->currentTimeInternal(isNull));
 
     EXPECT_FALSE(isNull);
 }
 
 TEST_F(AnimationAnimationTimelineTest, PlaybackRateFast)
 {
     timeline = AnimationTimeline::create(document.get());
-    double zeroTime = timeline->zeroTime();
     bool isNull;
 
     document->animationClock().updateTime(100);
-    EXPECT_EQ(zeroTime, timeline->zeroTime());
+    EXPECT_EQ(0, timeline->zeroTime());
     EXPECT_EQ(100, timeline->currentTimeInternal());
     EXPECT_EQ(100, timeline->currentTimeInternal(isNull));
     EXPECT_FALSE(isNull);
 
     timeline->setPlaybackRate(2.0);
     EXPECT_EQ(2.0, timeline->playbackRate());
     document->animationClock().updateTime(300);
-    EXPECT_EQ(zeroTime, timeline->zeroTime());
+    EXPECT_EQ(50, timeline->zeroTime());
     EXPECT_EQ(500, timeline->currentTimeInternal());
     EXPECT_EQ(500, timeline->currentTimeInternal(isNull));
 
     timeline->setPlaybackRate(1.0);
     EXPECT_EQ(1.0, timeline->playbackRate());
     document->animationClock().updateTime(400);
-    EXPECT_EQ(zeroTime - 200, timeline->zeroTime());
+    EXPECT_EQ(-200, timeline->zeroTime());
     EXPECT_EQ(600, timeline->currentTimeInternal());
     EXPECT_EQ(600, timeline->currentTimeInternal(isNull));
 
     EXPECT_FALSE(isNull);
 }
 
 TEST_F(AnimationAnimationTimelineTest, SetCurrentTime)
 {
     timeline = AnimationTimeline::create(document.get());
     double zeroTime = timeline->zeroTime();
@@ skipping 96 matching lines @@
 
 TEST_F(AnimationAnimationTimelineTest, UseAnimationPlayerAfterTimelineDeref)
 {
     RefPtrWillBeRawPtr<AnimationPlayer> player = timeline->createAnimationPlayer(0);
     timeline.clear();
     // Test passes if this does not crash.
     player->setStartTime(0);
 }
 
 }