From 98698b78016196964400acf1d69363efc4350dc8 Mon Sep 17 00:00:00 2001
From: Cameron McCormack <cam@mcc.id.au>
Date: Wed, 18 Oct 2017 17:11:04 +0800
Subject: [PATCH] geckolib: Add FFI function for checking document state
 dependencies.

---
 ports/geckolib/glue.rs | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/ports/geckolib/glue.rs b/ports/geckolib/glue.rs
index 45eb85d839e..c8a5140fcfd 100644
--- a/ports/geckolib/glue.rs
+++ b/ports/geckolib/glue.rs
@@ -21,7 +21,7 @@ use style::context::ThreadLocalStyleContext;
 use style::data::{ElementStyles, self};
 use style::dom::{ShowSubtreeData, TElement, TNode};
 use style::driver;
-use style::element_state::ElementState;
+use style::element_state::{DocumentState, ElementState};
 use style::error_reporting::{NullReporter, ParseErrorReporter};
 use style::font_metrics::{FontMetricsProvider, get_metrics_provider_for_product};
 use style::gecko::data::{GeckoStyleSheet, PerDocumentStyleData, PerDocumentStyleDataImpl};
@@ -4103,6 +4103,17 @@ pub extern "C" fn Servo_StyleSet_HasStateDependency(
     has_dep
 }
 
+#[no_mangle]
+pub extern "C" fn Servo_StyleSet_HasDocumentStateDependency(
+    raw_data: RawServoStyleSetBorrowed,
+    state: u64,
+) -> bool {
+    let state = DocumentState::from_bits_truncate(state);
+    let data = PerDocumentStyleData::from_ffi(raw_data).borrow();
+
+    data.stylist.has_document_state_dependency(state)
+}
+
 #[no_mangle]
 pub extern "C" fn Servo_GetCustomPropertyValue(
     computed_values: ServoStyleContextBorrowed,