cc: Plumb group id through animation creation and start/finish notifications

cc/test/layer_tree_test.h

Index: cc/test/layer_tree_test.h
diff --git a/cc/test/layer_tree_test.h b/cc/test/layer_tree_test.h
index 93506800b282199bd6993c5a7ece51c639043415..a36fee4bb86a9391b40dac4467f29e244f371bf8 100644
--- a/cc/test/layer_tree_test.h
+++ b/cc/test/layer_tree_test.h
@@ -91,11 +91,12 @@ class TestHooks : public AnimationDelegate {
 
   // Implementation of AnimationDelegate:
   virtual void NotifyAnimationStarted(base::TimeTicks monotonic_time,
-                                      Animation::TargetProperty target_property)
-      override {}
+                                      Animation::TargetProperty target_property,
+                                      int group) override {}
   virtual void NotifyAnimationFinished(
       base::TimeTicks monotonic_time,
-      Animation::TargetProperty target_property) override {}
+      Animation::TargetProperty target_property,
+      int group) override {}
 
   virtual void RequestNewOutputSurface(bool fallback) = 0;
 };