CC Animation: Use ElementId to attach CC animation players.

cc/animation/animation_host_perftest.cc

Index: cc/animation/animation_host_perftest.cc
diff --git a/cc/animation/animation_host_perftest.cc b/cc/animation/animation_host_perftest.cc
index 5003533d9bb06db0e2bca7b3be9d9250af110f29..e55b20015446482ce78048695ec6b7c49df1d28f 100644
--- a/cc/animation/animation_host_perftest.cc
+++ b/cc/animation/animation_host_perftest.cc
@@ -61,6 +61,7 @@ class AnimationHostPerfTest : public testing::Test {
 
     for (int i = 0; i < num_players; ++i) {
       scoped_refptr<Layer> layer = Layer::Create();
+      layer->SetElementId(NextTestElementId());
       root_layer_->AddChild(layer);
 
       scoped_refptr<AnimationPlayer> player =
@@ -68,7 +69,7 @@ class AnimationHostPerfTest : public testing::Test {
       last_player_id = AnimationIdProvider::NextPlayerId();
 
       timeline->AttachPlayer(player);
-      player->AttachElement(layer->id());
+      player->AttachElement(layer->element_id());
       EXPECT_TRUE(player->element_animations());
     }