cc : Track opacity animation changes on effect tree

cc/layers/layer.cc

Index: cc/layers/layer.cc
diff --git a/cc/layers/layer.cc b/cc/layers/layer.cc
index 92492afa97d7fdc4e30719125a8cb325a2227f81..ab348dac2b8ca383b6a9b9670083f900c815d105 100644
--- a/cc/layers/layer.cc
+++ b/cc/layers/layer.cc
@@ -1667,6 +1667,31 @@ void Layer::OnTransformIsPotentiallyAnimatingChanged(bool is_animating) {
   }
 }
 
+void Layer::OnOpacityIsCurrentlyAnimatingChanged(bool is_currently_animating) {
+  DCHECK(layer_tree_host_);
+  EffectTree& effect_tree = layer_tree_host_->property_trees()->effect_tree;
+  EffectNode* node = effect_tree.Node(effect_tree_index());
+  if (!node)
+    return;
+
+  if (node->owner_id == id())
+    node->data.is_currently_animating_opacity = is_currently_animating;
+}
+
+void Layer::OnOpacityIsPotentiallyAnimatingChanged(
+    bool has_potential_animation) {
+  DCHECK(layer_tree_host_);
+  EffectTree& effect_tree = layer_tree_host_->property_trees()->effect_tree;
+  EffectNode* node = effect_tree.Node(effect_tree_index());
+  if (!node)
+    return;
+  if (node->owner_id == id()) {
+    node->data.has_potential_opacity_animation =
+        has_potential_animation || OpacityCanAnimateOnImplThread();
+    effect_tree.set_needs_update(true);
+  }
+}
+
 bool Layer::HasActiveAnimationForTesting() const {
   return layer_tree_host_ ? layer_tree_host_->HasActiveAnimationForTesting(this)
                           : false;