Web Animations: Simplify mutable AnimationTimeline currentTime and playbackRate

Source/core/animation/AnimationTimelineTest.cpp

Index: Source/core/animation/AnimationTimelineTest.cpp
diff --git a/Source/core/animation/AnimationTimelineTest.cpp b/Source/core/animation/AnimationTimelineTest.cpp
index cd660cc6a201531d38132e9eb5f90d621a3f4205..07656513616ce4f05a4e3151f02244e90bae9298 100644
--- a/Source/core/animation/AnimationTimelineTest.cpp
+++ b/Source/core/animation/AnimationTimelineTest.cpp
@@ -211,11 +211,10 @@ TEST_F(AnimationAnimationTimelineTest, PlaybackRateNormal)
 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);
@@ -223,14 +222,14 @@ TEST_F(AnimationAnimationTimelineTest, PlaybackRatePause)
     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));
 
@@ -240,11 +239,10 @@ TEST_F(AnimationAnimationTimelineTest, PlaybackRatePause)
 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);
@@ -252,14 +250,14 @@ TEST_F(AnimationAnimationTimelineTest, PlaybackRateSlow)
     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));
 
@@ -269,11 +267,10 @@ TEST_F(AnimationAnimationTimelineTest, PlaybackRateSlow)
 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);
@@ -281,14 +278,14 @@ TEST_F(AnimationAnimationTimelineTest, PlaybackRateFast)
     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));