ozone/platform/wayland: Add some tests

ui/ozone/platform/wayland/BUILD.gn

Index: ui/ozone/platform/wayland/BUILD.gn
diff --git a/ui/ozone/platform/wayland/BUILD.gn b/ui/ozone/platform/wayland/BUILD.gn
index 98c74a42456f6b0a5aea9ba7931509b7393b2262..a2a8aa14cd53b972b4441c209afc1f02e1a4aec4 100644
--- a/ui/ozone/platform/wayland/BUILD.gn
+++ b/ui/ozone/platform/wayland/BUILD.gn
@@ -22,6 +22,31 @@ source_set("wayland") {
     "//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",
+  ]
 }