cc: Delay start of scrollbar animation setNeedsRedraw.

cc/thread_proxy.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/thread_proxy.h"
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "cc/context_provider.h"
@@ skipping 1298 matching lines @@
   // Need to make sure a delayed task is posted when we have smoothness
   // takes priority expiration time in the future.
   if (delay <= base::TimeDelta())
     return;
   if (renew_tree_priority_on_impl_thread_pending_)
     return;
 
   Proxy::ImplThread()->postDelayedTask(
       base::Bind(&ThreadProxy::RenewTreePriorityOnImplThread,
                  weak_factory_on_impl_thread_.GetWeakPtr()),
-      delay.InMilliseconds());
+      delay);
 
   renew_tree_priority_on_impl_thread_pending_ = true;
 }
 
 void ThreadProxy::RenewTreePriorityOnImplThread() {
   DCHECK(renew_tree_priority_on_impl_thread_pending_);
   renew_tree_priority_on_impl_thread_pending_ = false;
 
   RenewTreePriority();
 }
 
+void ThreadProxy::RequestScrollbarAnimationOnImplThread(base::TimeDelta delay) {
+  Proxy::ImplThread()->postDelayedTask(
+      base::Bind(&ThreadProxy::StartScrollbarAnimationOnImplThread,
+                 impl_thread_weak_ptr_),
+      delay);
+}
+
+void ThreadProxy::StartScrollbarAnimationOnImplThread() {
+  layer_tree_host_impl_->StartScrollbarAnimation(base::TimeTicks::Now());
+}
+
 }  // namespace cc