Blink Compositor Animation: Introduce CompositorAnimationHost correctly.

third_party/WebKit/Source/platform/animation/CompositorAnimationHostTest.cpp

Index: third_party/WebKit/Source/platform/animation/CompositorAnimationHostTest.cpp
diff --git a/third_party/WebKit/Source/platform/animation/CompositorAnimationHostTest.cpp b/third_party/WebKit/Source/platform/animation/CompositorAnimationHostTest.cpp
index d564b80f535556ed43930eeedd4e8ac47594c605..55916ee8a7e1c70e46cb340ce9c413972e20c9bc 100644
--- a/third_party/WebKit/Source/platform/animation/CompositorAnimationHostTest.cpp
+++ b/third_party/WebKit/Source/platform/animation/CompositorAnimationHostTest.cpp
@@ -22,19 +22,19 @@ TEST_F(CompositorAnimationHostTest, AnimationHostNullWhenTimelineDetached) {
   scoped_refptr<cc::AnimationTimeline> ccTimeline =
       timeline->animationTimeline();
   EXPECT_FALSE(ccTimeline->animation_host());
-  EXPECT_TRUE(timeline->compositorAnimationHost().isNull());
 
   std::unique_ptr<WebLayerTreeView> layerTreeHost =
       WTF::wrapUnique(new WebLayerTreeViewImplForTesting);
   DCHECK(layerTreeHost);
 
-  layerTreeHost->attachCompositorAnimationTimeline(
-      timeline->animationTimeline());
-  EXPECT_FALSE(timeline->compositorAnimationHost().isNull());
+  auto compositorAnimationHost = WTF::makeUnique<CompositorAnimationHost>(
+      layerTreeHost->compositorAnimationHost());
 
-  layerTreeHost->detachCompositorAnimationTimeline(
-      timeline->animationTimeline());
-  EXPECT_TRUE(timeline->compositorAnimationHost().isNull());
+  compositorAnimationHost->addTimeline(timeline.get());
+  EXPECT_TRUE(ccTimeline->animation_host());
+
+  compositorAnimationHost->removeTimeline(timeline.get());
+  EXPECT_FALSE(ccTimeline->animation_host());
 }
 
 }  // namespace blink