IWYU: missing include for std::vector usage in ozone platform screen

Bug: 819294
Change-Id: I04fb2cb5d939b9181ec8e42b0d0a9595b43c365a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2283315Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Commit-Queue: José Dapena Paz <jdapena@igalia.com>
Cr-Commit-Position: refs/heads/master@{#785825}

ui/ozone/public/platform_screen.h

@@ -7,6 +7,7 @@
 
 #include <set>
 #include <string>
+#include <vector>
 
 #include "base/component_export.h"
 #include "base/macros.h"