cc: LayerTreeHostImpl uses element id to tick animations

cc/input/scrollbar_animation_controller_unittest.cc

Index: cc/input/scrollbar_animation_controller_unittest.cc
diff --git a/cc/input/scrollbar_animation_controller_unittest.cc b/cc/input/scrollbar_animation_controller_unittest.cc
index 3d0855e65e1adeedc1842b264b4b39454ce6c77e..148c810ddd24068c9a0ed852f7ec4cba3c51adc2 100644
--- a/cc/input/scrollbar_animation_controller_unittest.cc
+++ b/cc/input/scrollbar_animation_controller_unittest.cc
@@ -1143,11 +1143,7 @@ class VerticalScrollbarAnimationControllerAndroidTest
 };
 
 TEST_F(ScrollbarAnimationControllerAndroidTest, DelayAnimationOnResize) {
-  scrollbar_layer_->layer_tree_impl()
-      ->property_trees()
-      ->effect_tree.OnOpacityAnimated(0.0f,
-                                      scrollbar_layer_->effect_tree_index(),
-                                      scrollbar_layer_->layer_tree_impl());
+  scrollbar_layer_->SetOverlayScrollbarLayerOpacityAnimated(0.f);
   scrollbar_controller_->DidScrollBegin();
   scrollbar_controller_->DidScrollUpdate(true);
   scrollbar_controller_->DidScrollEnd();
@@ -1155,11 +1151,7 @@ TEST_F(ScrollbarAnimationControllerAndroidTest, DelayAnimationOnResize) {
   EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
   EXPECT_EQ(delay_, base::TimeDelta::FromSeconds(2));
 
-  scrollbar_layer_->layer_tree_impl()
-      ->property_trees()
-      ->effect_tree.OnOpacityAnimated(0.0f,
-                                      scrollbar_layer_->effect_tree_index(),
-                                      scrollbar_layer_->layer_tree_impl());
+  scrollbar_layer_->SetOverlayScrollbarLayerOpacityAnimated(0.f);
   scrollbar_controller_->DidScrollUpdate(true);
   // Delay animation on resize to 5 seconds.
   EXPECT_FLOAT_EQ(1.0f, scrollbar_layer_->Opacity());
@@ -1167,22 +1159,14 @@ TEST_F(ScrollbarAnimationControllerAndroidTest, DelayAnimationOnResize) {
 }
 
 TEST_F(ScrollbarAnimationControllerAndroidTest, HiddenInBegin) {
-  scrollbar_layer_->layer_tree_impl()
-      ->property_trees()
-      ->effect_tree.OnOpacityAnimated(0.0f,
-                                      scrollbar_layer_->effect_tree_index(),
-                                      scrollbar_layer_->layer_tree_impl());
+  scrollbar_layer_->SetOverlayScrollbarLayerOpacityAnimated(0.f);
   scrollbar_controller_->Animate(base::TimeTicks());
   EXPECT_FLOAT_EQ(0.0f, scrollbar_layer_->Opacity());
 }
 
 TEST_F(ScrollbarAnimationControllerAndroidTest,
        HiddenAfterNonScrollingGesture) {
-  scrollbar_layer_->layer_tree_impl()
-      ->property_trees()
-      ->effect_tree.OnOpacityAnimated(0.0f,
-                                      scrollbar_layer_->effect_tree_index(),
-                                      scrollbar_layer_->layer_tree_impl());
+  scrollbar_layer_->SetOverlayScrollbarLayerOpacityAnimated(0.f);
   scrollbar_controller_->DidScrollBegin();
 
   base::TimeTicks time;