ozone/platform/wayland: Add some tests

ui/ozone/platform/wayland/BUILD.gn

 # 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.
 
 source_set("wayland") {
   sources = [
     "client_native_pixmap_factory_wayland.cc",
     "client_native_pixmap_factory_wayland.h",
     "ozone_platform_wayland.cc",
     "ozone_platform_wayland.h",
     "wayland_display.cc",
     "wayland_display.h",
     "wayland_object.h",
     "wayland_surface_factory.cc",
     "wayland_surface_factory.h",
     "wayland_window.cc",
     "wayland_window.h",
   ]
 
   deps = [
     "//base",
     "//skia",
     "//third_party/wayland:wayland_client",
     "//third_party/wayland-protocols:xdg_shell_protocol",
+    "//ui/events/platform",
     "//ui/ozone:ozone_base",
   ]
+
+  defines = [ "OZONE_IMPLEMENTATION" ]
 }
+
+source_set("wayland_unittests") {
+  testonly = true
+
+  sources = [
+    "fake_server.cc",
+    "fake_server.h",
+    "mock_platform_window_delegate.cc",
+    "wayland_display_unittest.cc",
+    "wayland_surface_factory_unittest.cc",
+    "wayland_window_unittest.cc",
+  ]
+
+  deps = [
+    "//testing/gmock",
+    "//testing/gtest",
+    "//third_party/wayland:wayland_server",
+    "//third_party/wayland-protocols:xdg_shell_protocol",
+    "//ui/gfx:test_support",
+    "//ui/ozone",
+  ]
+}