Impl thread smooth scrolling.

cc/layers/layer_impl.cc

Index: cc/layers/layer_impl.cc
diff --git a/cc/layers/layer_impl.cc b/cc/layers/layer_impl.cc
index 231f4aab03a6bcb0380aaf464b2263f329b8fb34..6fbb0754cbdc8a0aebd48ec2fefdc6cb09d83c85 100644
--- a/cc/layers/layer_impl.cc
+++ b/cc/layers/layer_impl.cc
@@ -77,6 +77,7 @@ LayerImpl::LayerImpl(LayerTreeImpl* tree_impl, int id)
   layer_animation_controller_->AddValueObserver(this);
   if (IsActive())
     layer_animation_controller_->set_value_provider(this);
+  layer_animation_controller_->set_layer_animation_delegate(this);

[ajuma, 2014/07/08 18:45:32]

Like the previous line, this needs to happen only for active layers (or else
active and pending layers will compete for becoming the animation delegate,
since active and pending layers share a single animation controller).

[skobes, 2014/07/08 21:21:58]

Done.

   SetNeedsPushProperties();
 }
 
@@ -1492,4 +1493,12 @@ scoped_ptr<base::Value> LayerImpl::AsValue() const {
 void LayerImpl::RunMicroBenchmark(MicroBenchmarkImpl* benchmark) {
   benchmark->RunOnLayer(this);
 }
+
+void LayerImpl::NotifyAnimationFinished(
+    base::TimeTicks monotonic_time,
+    Animation::TargetProperty target_property) {
+  if (target_property == Animation::ScrollOffset)
+    layer_tree_impl_->ScrollOffsetAnimationFinished();
+}
+
 }  // namespace cc