From 0b0ff2b15217e5cdcaceca92bb301e80d7e472d2 Mon Sep 17 00:00:00 2001
From: Xidorn Quan <me@upsuper.org>
Date: Thu, 3 Nov 2016 14:44:27 +1100
Subject: [PATCH] Add binding function to create empty DeclarationBlock

---
 components/style/gecko_bindings/bindings.rs | 4 ++++
 ports/geckolib/glue.rs                      | 5 +++++
 2 files changed, 9 insertions(+)

diff --git a/components/style/gecko_bindings/bindings.rs b/components/style/gecko_bindings/bindings.rs
index 4a5350f0134..e9cb580d217 100644
--- a/components/style/gecko_bindings/bindings.rs
+++ b/components/style/gecko_bindings/bindings.rs
@@ -922,6 +922,10 @@ extern "C" {
     pub fn Servo_ParseStyleAttribute(data: *const nsACString_internal)
      -> RawServoDeclarationBlockStrong;
 }
+extern "C" {
+    pub fn Servo_DeclarationBlock_CreateEmpty()
+     -> RawServoDeclarationBlockStrong;
+}
 extern "C" {
     pub fn Servo_DeclarationBlock_Equals(a: RawServoDeclarationBlockBorrowed,
                                          b: RawServoDeclarationBlockBorrowed)
diff --git a/ports/geckolib/glue.rs b/ports/geckolib/glue.rs
index 4b2fe8d5e77..ba4a023b715 100644
--- a/ports/geckolib/glue.rs
+++ b/ports/geckolib/glue.rs
@@ -420,6 +420,11 @@ pub extern "C" fn Servo_ParseStyleAttribute(data: *const nsACString) -> RawServo
     Arc::new(RwLock::new(GeckoElement::parse_style_attribute(value))).into_strong()
 }
 
+#[no_mangle]
+pub extern "C" fn Servo_DeclarationBlock_CreateEmpty() -> RawServoDeclarationBlockStrong {
+    Arc::new(RwLock::new(PropertyDeclarationBlock { declarations: vec![], important_count: 0 })).into_strong()
+}
+
 #[no_mangle]
 pub extern "C" fn Servo_DeclarationBlock_AddRef(declarations: RawServoDeclarationBlockBorrowed) {
     unsafe { RwLock::<PropertyDeclarationBlock>::addref(declarations) };