Adds capture to the mojo window_manager.

mojo/services/view_manager/public/cpp/lib/view.cc

 // Copyright 2014 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 "mojo/services/view_manager/public/cpp/view.h"
 
 #include <set>
 
 #include "mojo/public/cpp/application/service_provider_impl.h"
 #include "mojo/services/view_manager/public/cpp/lib/view_manager_client_impl.h"
@@ skipping 255 matching lines @@
 }
 
 void View::AddObserver(ViewObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void View::RemoveObserver(ViewObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
+View* View::GetRoot() {
+  View* root = this;
+  for (View* parent = this; parent; parent = parent->parent())
+    root = parent;
+  return root;
+}
+
 const View* View::GetRoot() const {
   const View* root = this;
   for (const View* parent = this; parent; parent = parent->parent())
     root = parent;
   return root;
 }
 
 void View::AddChild(View* child) {
   // TODO(beng): not necessarily valid to all connections, but possibly to the
   //             embeddee in an embedder-embeddee relationship.
@@ skipping 262 matching lines @@
 void View::NotifyViewVisibilityChangedUp(View* target) {
   // Start with the parent as we already notified |this|
   // in NotifyViewVisibilityChangedDown.
   for (View* view = parent(); view; view = view->parent()) {
     bool ret = view->NotifyViewVisibilityChangedAtReceiver(target);
     DCHECK(ret);
   }
 }
 
 }  // namespace mojo