Update from https://crrev.com/312398

cc/test/animation_test_common.cc

Index: cc/test/animation_test_common.cc
diff --git a/cc/test/animation_test_common.cc b/cc/test/animation_test_common.cc
index ccd08286abcb56376cdc1e85851d2b9a0b8508eb..f3fc212faeaaa88ec3442c16220e1ef86d910ea6 100644
--- a/cc/test/animation_test_common.cc
+++ b/cc/test/animation_test_common.cc
@@ -207,7 +207,9 @@ float FakeFloatTransition::GetValue(base::TimeDelta time) const {
 
 FakeLayerAnimationValueObserver::FakeLayerAnimationValueObserver()
     : opacity_(0.0f),
-      animation_waiting_for_deletion_(false) {}
+      animation_waiting_for_deletion_(false),
+      scroll_offset_animation_removed_(false) {
+}
 
 FakeLayerAnimationValueObserver::~FakeLayerAnimationValueObserver() {}
 
@@ -234,6 +236,10 @@ void FakeLayerAnimationValueObserver::OnAnimationWaitingForDeletion() {
   animation_waiting_for_deletion_ = true;
 }
 
+void FakeLayerAnimationValueObserver::OnScrollOffsetAnimationRemoved() {
+  scroll_offset_animation_removed_ = true;
+}
+
 bool FakeLayerAnimationValueObserver::IsActive() const {
   return true;
 }