[WIP] ScreenManager: Add an external window mode

services/ui/ws/display_unittest.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 <stdint.h>
 
 #include <string>
 
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 90 matching lines @@
     return window_server()->display_manager();
   }
   TestWindowServerDelegate* window_server_delegate() {
     return ws_test_helper_.window_server_delegate();
   }
   TestScreenManager& screen_manager() { return screen_manager_; }
 
  protected:
   // testing::Test:
   void SetUp() override {
-    screen_manager_.Init(window_server()->display_manager());
+    screen_manager_.Init(window_server()->display_manager(),
+                         display::ScreenManager::WINDOW_MODE_INTERNAL);
     window_server()->user_id_tracker()->AddUserId(kTestId1);
     window_server()->user_id_tracker()->AddUserId(kTestId2);
   }
 
  private:
   WindowServerTestHelper ws_test_helper_;
   TestScreenManager screen_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayTest);
 };
@@ skipping 295 matching lines @@
   ASSERT_EQ(0u, tree_client->tracker()->changes()->size());
 
   // The window should be destroyed when the client says so.
   ASSERT_TRUE(tree->DeleteWindow(secondary_root_id));
   EXPECT_TRUE(secondary_root_destroyed);
 }
 
 }  // namespace test
 }  // namespace ws
 }  // namespace ui