Adds a CloneAndAnimate function to WindowManagerInternalClient

mojo/services/view_manager/window_manager_access_policy.cc

Index: mojo/services/view_manager/window_manager_access_policy.cc
diff --git a/mojo/services/view_manager/window_manager_access_policy.cc b/mojo/services/view_manager/window_manager_access_policy.cc
index 8a477f064d4b5c71ecf7029f874157f1fce3f59e..625b24ac16abc0d79ab33d91d2c56428093c4090 100644
--- a/mojo/services/view_manager/window_manager_access_policy.cc
+++ b/mojo/services/view_manager/window_manager_access_policy.cc
@@ -44,12 +44,12 @@ bool WindowManagerAccessPolicy::CanDeleteView(const ServerView* view) const {
 }
 
 bool WindowManagerAccessPolicy::CanGetViewTree(const ServerView* view) const {
-  return true;
+  return view->id() != ClonedViewId();
 }
 
 bool WindowManagerAccessPolicy::CanDescendIntoViewForViewTree(
     const ServerView* view) const {
-  return true;
+  return view->id() != ClonedViewId();
 }
 
 bool WindowManagerAccessPolicy::CanEmbed(const ServerView* view) const {
@@ -82,6 +82,9 @@ bool WindowManagerAccessPolicy::ShouldNotifyOnHierarchyChange(
     const ServerView* view,
     const ServerView** new_parent,
     const ServerView** old_parent) const {
+  if (view->id() == ClonedViewId())
+    return false;
+
   // Notify if we've already told the window manager about the view, or if we've
   // already told the window manager about the parent. The later handles the
   // case of a view that wasn't parented to the root getting added to the root.