Add PlatformScreenDelegate and start implementation.

services/ui/ws/cursor_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 26 matching lines @@
 
 class CursorTest : public testing::Test {
  public:
   CursorTest() : cursor_id_(-1), platform_display_factory_(&cursor_id_) {}
   ~CursorTest() 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>(new SurfacesState)));
+    window_server_.reset(new WindowServer(&window_server_delegate_));
     window_server_delegate_.set_window_server(window_server_.get());
 
     window_server_delegate_.set_num_displays_to_create(1);
 
     // As a side effect, this allocates Displays.
     WindowManagerWindowTreeFactorySetTestApi(
         window_server_->window_manager_window_tree_factory_set())
         .Add(kTestId1);
     window_server_->user_id_tracker()->AddUserId(kTestId1);
     window_server_->user_id_tracker()->SetActiveUserId(kTestId1);
@@ skipping 129 matching lines @@
   MoveCursorTo(gfx::Point(15, 15));
   EXPECT_EQ(mojom::Cursor::EAST_RESIZE, mojom::Cursor(cursor_id_));
 
   win->SetBounds(gfx::Rect(0, 0, 30, 30));
   EXPECT_EQ(mojom::Cursor::IBEAM, mojom::Cursor(cursor_id_));
 }
 
 }  // namespace test
 }  // namespace ws
 }  // namespace ui