Fix compositor_unittests with Ozone X11.

ui/compositor/test/test_suite.cc

Index: ui/compositor/test/test_suite.cc
diff --git a/ui/compositor/test/test_suite.cc b/ui/compositor/test/test_suite.cc
index 2403d36eb630ea1ebca2acf8334ae5543b6d70ce..c315a574f741d6d49256369dce06ae16a6c3ee42 100644
--- a/ui/compositor/test/test_suite.cc
+++ b/ui/compositor/test/test_suite.cc
@@ -13,6 +13,10 @@
 #include "ui/gfx/gfx_paths.h"
 #include "ui/gl/test/gl_surface_test_support.h"
 
+#if defined(USE_OZONE)
+#include "ui/ozone/public/ozone_platform.h"
+#endif
+
 #if defined(OS_WIN)
 #include "ui/display/win/dpi.h"
 #endif
@@ -29,6 +33,10 @@ void CompositorTestSuite::Initialize() {
   base::TestSuite::Initialize();
   gl::GLSurfaceTestSupport::InitializeOneOff();
 
+#if defined(USE_OZONE)
+  ui::OzonePlatform::InitializeForUI();
+#endif
+
   gfx::RegisterPathProvider();
 
 #if defined(OS_WIN)