Add PlatformScreenDelegate and start implementation.

services/ui/ws/user_display_manager_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/atomicops.h"
 #include "base/macros.h"
@@ skipping 81 matching lines @@
 class UserDisplayManagerTest : public testing::Test {
  public:
   UserDisplayManagerTest()
       : cursor_id_(0), platform_display_factory_(&cursor_id_) {}
   ~UserDisplayManagerTest() override {}
 
  protected:
   // testing::Test:
   void SetUp() override {
     PlatformDisplay::set_factory_for_testing(&platform_display_factory_);
-    window_server_.reset(new WindowServer(&window_server_delegate_,
-                                          scoped_refptr<SurfacesState>()));
+    window_server_.reset(new WindowServer(&window_server_delegate_));
     window_server_delegate_.set_window_server(window_server_.get());
   }
 
  protected:
   int32_t cursor_id_;
   TestPlatformDisplayFactory platform_display_factory_;
   TestWindowServerDelegate window_server_delegate_;
   std::unique_ptr<WindowServer> window_server_;
   base::MessageLoop message_loop_;
 
@@ skipping 121 matching lines @@
   base::subtle::Atomic32 location =
       base::subtle::NoBarrier_Load(cursor_location_memory);
   EXPECT_EQ(gfx::Point(static_cast<int16_t>(location >> 16),
                        static_cast<int16_t>(location & 0xFFFF)),
             gfx::Point(-10, -11));
 }
 
 }  // namespace test
 }  // namespace ws
 }  // namespace ui