mus: The window server needs to be able to write to the clipboard.

services/ui/ws/window_server.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 "services/ui/ws/window_server.h"
 
 #include <set>
 #include <string>
 
 #include "base/logging.h"
@@ skipping 224 matching lines @@
 void WindowServer::OnFirstWindowManagerWindowTreeFactoryReady() {
   if (display_manager_->has_active_or_pending_displays())
     return;
 
   // We've been supplied a WindowManagerFactory and no displays have been
   // created yet. Treat this as a signal to create a Display.
   // TODO(sky): we need a better way to determine this, most likely a switch.
   delegate_->CreateDefaultDisplays();
 }
 
+ui::clipboard::ClipboardImpl* WindowServer::GetClipboardForUser(
+    const UserId& user_id) {
+  DCHECK_GT(clipboard_map_.count(user_id), 0u);
+  return clipboard_map_[user_id].get();
+}
+
 UserActivityMonitor* WindowServer::GetUserActivityMonitorForUser(
     const UserId& user_id) {
   DCHECK_GT(activity_monitor_map_.count(user_id), 0u);
   return activity_monitor_map_[user_id].get();
 }
 
 bool WindowServer::SetFocusedWindow(ServerWindow* window) {
   // TODO(sky): this should fail if there is modal dialog active and |window|
   // is outside that.
   ServerWindow* currently_focused = GetFocusedWindow();
@@ skipping 507 matching lines @@
       IsUserInHighContrastMode(active_id))
     return;
   for (Display* display : display_manager_->displays()) {
     display->SchedulePaint(display->root_window(),
                            gfx::Rect(display->root_window()->bounds().size()));
   }
 }
 
 void WindowServer::OnUserIdAdded(const UserId& id) {
   activity_monitor_map_[id] = base::MakeUnique<UserActivityMonitor>(nullptr);
+  clipboard_map_[id] = base::MakeUnique<clipboard::ClipboardImpl>();
 }
 
 void WindowServer::OnUserIdRemoved(const UserId& id) {
   activity_monitor_map_.erase(id);
+  clipboard_map_.erase(id);
 }
 
 }  // namespace ws
 }  // namespace ui