ozone/platform/wayland: Use more realistic event processing and request flushing in tests

ui/ozone/platform/wayland/fake_server.h

 // 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.
 
 #ifndef UI_OZONE_PLATFORM_WAYLAND_FAKE_SERVER_H_
 #define UI_OZONE_PLATFORM_WAYLAND_FAKE_SERVER_H_
 
 #include <wayland-server-core.h>
 
 #include "base/bind.h"
@@ skipping 128 matching lines @@
   FakeServer();
   ~FakeServer() override;
 
   // Start the fake Wayland server. If this succeeds, the WAYLAND_SOCKET
   // environment variable will be set to the string representation of a file
   // descriptor that a client can connect to. The caller is responsible for
   // ensuring that this file descriptor gets closed (for example, by calling
   // wl_display_connect).
   bool Start();
 
-  void Flush();
+  // Pause the server when it becomes idle.
+  void Pause();
 
-  void Pause();
+  // Resume the server after flushing client connections.
   void Resume();
 
   template <typename T>
   T* GetObject(uint32_t id) {
     wl_resource* resource = wl_client_get_object(client_, id);
     return resource ? T::FromResource(resource) : nullptr;
   }
 
   MockXdgShell* xdg_shell() { return &xdg_shell_; }
 
@@ skipping 18 matching lines @@
   MockXdgShell xdg_shell_;
 
   base::MessagePumpLibevent::FileDescriptorWatcher controller_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeServer);
 };
 
 }  // namespace wl
 
 #endif  // UI_OZONE_PLATFORM_WAYLAND_FAKE_SERVER_H_