Bug 1364412: Expose pseudo-element flags, and properly reject pseudos in non-UA sheets. r=bholley

MozReview-Commit-ID: KYC1ywfI7Lg
Signed-off-by: Emilio Cobos Álvarez <emilio@crisal.io>

--HG--
extra : rebase_source : 924c2fb9b20da5e243faa3ed527c35103b50c742

layout/style/ServoBindings.h

@@ -555,6 +555,12 @@ bool Gecko_DocumentRule_UseForPresentation(RawGeckoPresContextBorrowed,
 // Allocator hinting.
 void Gecko_SetJemallocThreadLocalArena(bool enabled);
 
+// Pseudo-element flags.
+#define CSS_PSEUDO_ELEMENT(name_, value_, flags_) \
+  const uint32_t SERVO_CSS_PSEUDO_ELEMENT_FLAGS_##name_ = flags_;
+#include "nsCSSPseudoElementList.h"
+#undef CSS_PSEUDO_ELEMENT
+
 #define SERVO_BINDING_FUNC(name_, return_, ...) return_ name_(__VA_ARGS__);
 #include "mozilla/ServoBindingList.h"
 #undef SERVO_BINDING_FUNC