CC Animations: Fix draw properties invalidation on LAC destruction

cc/trees/layer_tree_host_unittest_animation_timelines.cc

Index: cc/trees/layer_tree_host_unittest_animation_timelines.cc
diff --git a/cc/trees/layer_tree_host_unittest_animation_timelines.cc b/cc/trees/layer_tree_host_unittest_animation_timelines.cc
index da0c6ef56148d592db651d921fc9997a85a9e799..c95a5ca1a8af104b4c1a0c408f6ab1bee407a14e 100644
--- a/cc/trees/layer_tree_host_unittest_animation_timelines.cc
+++ b/cc/trees/layer_tree_host_unittest_animation_timelines.cc
@@ -1000,7 +1000,7 @@ MULTI_THREAD_TEST_F(LayerTreeHostTimelinesTestAnimationFinishesDuringCommit);
 
 // Check that SetTransformIsPotentiallyAnimatingChanged is called
 // if we destroy LayerAnimationController and ElementAnimations.
-class DISABLED_LayerTreeHostTimelinesTestSetPotentiallyAnimatingOnLacDestruction
+class LayerTreeHostTimelinesTestSetPotentiallyAnimatingOnLacDestruction
     : public LayerTreeHostTimelinesTest {
  public:
   void SetupTree() override {
@@ -1013,23 +1013,30 @@ class DISABLED_LayerTreeHostTimelinesTestSetPotentiallyAnimatingOnLacDestruction
   void BeginTest() override { PostSetNeedsCommitToMainThread(); }
 
   void CommitCompleteOnThread(LayerTreeHostImpl* host_impl) override {
-    if (host_impl->active_tree()->source_frame_number() == 2) {
+    if (host_impl->active_tree()->source_frame_number() == 1) {
       EXPECT_TRUE(host_impl->active_tree());
       EXPECT_TRUE(host_impl->active_tree()->root_layer());
       EXPECT_TRUE(host_impl->pending_tree());
       EXPECT_TRUE(host_impl->pending_tree()->root_layer());
 
+      EXPECT_EQ(2, host_impl->pending_tree()->source_frame_number());
+
       EXPECT_TRUE(host_impl->active_tree()
                       ->root_layer()
                       ->screen_space_transform_is_animating());
       EXPECT_FALSE(host_impl->pending_tree()
                        ->root_layer()
                        ->screen_space_transform_is_animating());
+    } else if (host_impl->active_tree()->source_frame_number() == 2) {
+      EXPECT_FALSE(host_impl->active_tree()
+                       ->root_layer()
+                       ->screen_space_transform_is_animating());
+      EXPECT_FALSE(host_impl->pending_tree()
+                       ->root_layer()
+                       ->screen_space_transform_is_animating());
     }
   }
 
-  void WillCommit() override {}
-
   void DidCommit() override { PostSetNeedsCommitToMainThread(); }
 
   void UpdateLayerTreeHost() override {
@@ -1049,7 +1056,7 @@ class DISABLED_LayerTreeHostTimelinesTestSetPotentiallyAnimatingOnLacDestruction
 };
 
 MULTI_THREAD_TEST_F(
-    DISABLED_LayerTreeHostTimelinesTestSetPotentiallyAnimatingOnLacDestruction);
+    LayerTreeHostTimelinesTestSetPotentiallyAnimatingOnLacDestruction);
 
 // Check that we invalidate property trees on AnimationPlayer::SetNeedsCommit.
 class LayerTreeHostTimelinesTestRebuildPropertyTreesOnAnimationSetNeedsCommit