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

cc/animation/layer_animation_controller.cc

Index: cc/animation/layer_animation_controller.cc
diff --git a/cc/animation/layer_animation_controller.cc b/cc/animation/layer_animation_controller.cc
index 9aa67aa223a40603fc6619c8fef4110077090b4a..d88337baf24529b52df1495a2c8282c336f185a4 100644
--- a/cc/animation/layer_animation_controller.cc
+++ b/cc/animation/layer_animation_controller.cc
@@ -314,8 +314,8 @@ void LayerAnimationController::NotifyAnimationStarted(
     FOR_EACH_OBSERVER(LayerAnimationEventObserver, event_observers_,
                       OnAnimationStarted(event));
     if (layer_animation_delegate_)
-      layer_animation_delegate_->NotifyAnimationStarted(event.monotonic_time,
-                                                        event.target_property);
+      layer_animation_delegate_->NotifyAnimationStarted(
+          event.monotonic_time, event.target_property, event.group_id);
     return;
   }
 
@@ -331,7 +331,7 @@ void LayerAnimationController::NotifyAnimationStarted(
                         OnAnimationStarted(event));
       if (layer_animation_delegate_)
         layer_animation_delegate_->NotifyAnimationStarted(
-            event.monotonic_time, event.target_property);
+            event.monotonic_time, event.target_property, event.group_id);
 
       return;
     }
@@ -342,8 +342,8 @@ void LayerAnimationController::NotifyAnimationFinished(
     const AnimationEvent& event) {
   if (event.is_impl_only) {
     if (layer_animation_delegate_)
-      layer_animation_delegate_->NotifyAnimationFinished(event.monotonic_time,
-                                                         event.target_property);
+      layer_animation_delegate_->NotifyAnimationFinished(
+          event.monotonic_time, event.target_property, event.group_id);
     return;
   }
 
@@ -353,7 +353,7 @@ void LayerAnimationController::NotifyAnimationFinished(
       animations_[i]->set_received_finished_event(true);
       if (layer_animation_delegate_)
         layer_animation_delegate_->NotifyAnimationFinished(
-            event.monotonic_time, event.target_property);
+            event.monotonic_time, event.target_property, event.group_id);
 
       return;
     }