cc: Add mask and replica layer ids to the effect tree

cc/proto/property_tree.proto

Index: cc/proto/property_tree.proto
diff --git a/cc/proto/property_tree.proto b/cc/proto/property_tree.proto
index 38cd5a946098606e0fe143141ec07e72da4f3418..889068e65a4dd7f4fa1a89502b6387f76486512f 100644
--- a/cc/proto/property_tree.proto
+++ b/cc/proto/property_tree.proto
@@ -89,7 +89,7 @@ message ClipNodeData {
 }
 
 // Proto for struct EffectNodeData.
-// NEXT ID: 17
+// NEXT ID: 20
 message EffectNodeData {
   optional float opacity = 1;
   optional float screen_space_opacity = 2;
@@ -107,6 +107,9 @@ message EffectNodeData {
   optional int64 transform_id = 9;
   optional int64 clip_id = 10;
   optional int64 target_id = 12;
+  optional int64 mask_layer_id = 17;
+  optional int64 replica_layer_id = 18;
+  optional int64 replica_mask_layer_id = 19;
 }
 
 // Proto for struct ScrollNodeData
@@ -166,6 +169,7 @@ message PropertyTree {
   // of this property tree.
   optional TransformTreeData transform_tree_data = 1000;
   optional ScrollTreeData scroll_tree_data = 1001;
+  optional EffectTreeData effect_tree_data = 1002;
 }
 
 message ScrollOffsetMapEntry {
@@ -192,6 +196,11 @@ message TransformTreeData {
   repeated TransformCachedNodeData cached_data = 9;
 }
 
+// Proto for data members of class EffectTree.
+message EffectTreeData {
+  repeated int64 mask_replica_layer_ids = 1 [packed = true];
+}
+
 // Proto for class PropertyTrees.
 // NEXT ID: 16
 message PropertyTrees {