ozone/platform/wayland: Add WaylandTest base class to eliminate redundancy

ui/ozone/platform/wayland/mock_platform_window_delegate.h

Index: ui/ozone/platform/wayland/mock_platform_window_delegate.h
diff --git a/ui/ozone/platform/wayland/mock_platform_window_delegate.h b/ui/ozone/platform/wayland/mock_platform_window_delegate.h
index 7b8967dfa809c932a0db1e2e8580342027dc20d7..d9092e5879bc6c5d17542ba24f4f81e9ac6699f3 100644
--- a/ui/ozone/platform/wayland/mock_platform_window_delegate.h
+++ b/ui/ozone/platform/wayland/mock_platform_window_delegate.h
@@ -2,6 +2,9 @@
 // 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_MOCK_PLATFORM_WINDOW_DELEGATE_H_
+#define UI_OZONE_PLATFORM_WAYLAND_MOCK_PLATFORM_WINDOW_DELEGATE_H_
+
 #include "ui/platform_window/platform_window_delegate.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "ui/gfx/geometry/rect.h"
@@ -30,3 +33,5 @@ class MockPlatformWindowDelegate : public PlatformWindowDelegate {
 };
 
 }  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_WAYLAND_MOCK_PLATFORM_WINDOW_DELEGATE_H_