Reland r107720 - Enable the new layer animation framework.

ui/aura_shell/workspace/workspace_manager.cc

Index: ui/aura_shell/workspace/workspace_manager.cc
diff --git a/ui/aura_shell/workspace/workspace_manager.cc b/ui/aura_shell/workspace/workspace_manager.cc
index 410ace11474528ced8138181083bd90fb09c7f42..89fbe5339b05b9102419cec8379ae8aa49efe1d5 100644
--- a/ui/aura_shell/workspace/workspace_manager.cc
+++ b/ui/aura_shell/workspace/workspace_manager.cc
@@ -117,7 +117,8 @@ void WorkspaceManager::SetOverview(bool overview) {
     transform.SetTranslateX(-active_workspace_->bounds().x());
   }
 
-  viewport_->layer()->SetAnimation(aura::Window::CreateDefaultAnimation());
+  aura::Window::ScopedAnimationSettings settings(
+      viewport_->layer()->GetAnimator());
   viewport_->layer()->SetTransform(transform);
 }
 
@@ -192,7 +193,8 @@ void WorkspaceManager::UpdateViewport() {
   if (active_workspace_) {
     ui::Transform transform;
     transform.SetTranslateX(-active_workspace_->bounds().x());
-    viewport_->layer()->SetAnimation(aura::Window::CreateDefaultAnimation());
+    aura::Window::ScopedAnimationSettings settings(
+        viewport_->layer()->GetAnimator());
     viewport_->SetTransform(transform);
   }
 }