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 4a6ecaa7ee52f81381c2be1ffd637e85cbe0b173..c8904ea695d310abf48015158891112a05e3634b 100644
--- a/ui/aura_shell/workspace/workspace_manager.cc
+++ b/ui/aura_shell/workspace/workspace_manager.cc
@@ -131,7 +131,7 @@ void WorkspaceManager::SetOverview(bool overview) {
     transform.SetTranslateX(-active_workspace_->bounds().x());
   }
 
-  viewport_->layer()->SetAnimation(aura::Window::CreateDefaultAnimation());
+  ui::LayerAnimator::ScopedSettings settings(viewport_->layer()->GetAnimator());
   viewport_->layer()->SetTransform(transform);
 }
 
@@ -247,7 +247,8 @@ void WorkspaceManager::UpdateViewport() {
   if (active_workspace_) {
     ui::Transform transform;
     transform.SetTranslateX(-active_workspace_->bounds().x());
-    viewport_->layer()->SetAnimation(aura::Window::CreateDefaultAnimation());
+    ui::LayerAnimator::ScopedSettings settings(
+        viewport_->layer()->GetAnimator());
     viewport_->SetTransform(transform);
   }
 }