Reorder browser list on workspace switch

ui/display/desktop.cc

+// Copyright 2016 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 "ui/display/desktop.h"
+
+namespace display {
+
+namespace {
+
+Desktop* g_desktop;
+
+}  // namespace
+
+Desktop::Desktop() {}
+
+Desktop::~Desktop() {}
+
+// static
+Desktop* Desktop::GetDesktop() {
+  return g_desktop;
+}
+
+// static
+void Desktop::SetDesktopInstance(Desktop* instance) {
+  g_desktop = instance;
+}
+
+void Desktop::AddObserver(DesktopObserver* observer) {
+  desktop_observer_list_.AddObserver(observer);
+}
+
+void Desktop::RemoveObserver(DesktopObserver* observer) {
+  desktop_observer_list_.RemoveObserver(observer);
+}
+
+}  // namespace display