Get rid of the ForNewlyBoundElement mode.

MozReview-Commit-ID: 1IRn2iaPnVc

components/style/traversal_flags.rs

@@ -20,8 +20,6 @@ bitflags! {
         const UnstyledChildrenOnly = 1 << 2,
         /// FIXME(bholley): This will go away.
         const ForReconstruct = 1 << 3,
-        /// FIXME(bholley): This will go away.
-        const ForNewlyBoundElement = 1 << 4,
     }
 }
 
@@ -49,7 +47,6 @@ pub fn assert_traversal_flags_match() {
         ServoTraversalFlags_ForCSSRuleChanges => ForCSSRuleChanges,
         ServoTraversalFlags_UnstyledChildrenOnly => UnstyledChildrenOnly,
         ServoTraversalFlags_ForReconstruct => ForReconstruct,
-        ServoTraversalFlags_ForNewlyBoundElement => ForNewlyBoundElement,
     }
 }
 

ports/geckolib/glue.rs

@@ -291,14 +291,6 @@ pub extern "C" fn Servo_TraverseSubtree(root: RawGeckoElementBorrowed,
                      traversal_flags,
                      unsafe { &*snapshots });
 
-    if traversal_flags.contains(traversal_flags::ForNewlyBoundElement) {
-        // In this mode, we only ever restyle new elements, so there is no
-        // need for a post-traversal, and the borrow_data().unwrap() call below
-        // could panic, so we don't bother computing whether a post-traversal
-        // is required.
-        return false;
-    }
-
     element.has_dirty_descendants() ||
     element.has_animation_only_dirty_descendants() ||
     element.borrow_data().unwrap().restyle.contains_restyle_data()
@@ -2816,6 +2808,18 @@ pub extern "C" fn Servo_ResolveStyle(element: RawGeckoElementBorrowed,
     data.styles.primary().clone().into()
 }
 
+#[no_mangle]
+pub extern "C" fn Servo_ResolveStyleAllowStale(element: RawGeckoElementBorrowed)
+                                               -> ServoStyleContextStrong
+{
+    let element = GeckoElement(element);
+    debug!("Servo_ResolveStyleAllowStale: {:?}", element);
+    let data =
+        element.borrow_data().expect("Resolving style on unstyled element");
+    assert!(data.has_styles(), "Resolving style on unstyled element");
+    data.styles.primary().clone().into()
+}
+
 #[no_mangle]
 pub extern "C" fn Servo_ResolveStyleLazily(element: RawGeckoElementBorrowed,
                                            pseudo_type: CSSPseudoElementType,