From 4c6b1c3dec542458ed97afea9265a01aa138c551 Mon Sep 17 00:00:00 2001
From: Wei-Cheng Pan <wpan@mozilla.com>
Date: Wed, 6 Sep 2017 15:42:05 +0800
Subject: [PATCH] Bug 1397168 - Add a function to find out if a node has any
 ancestor that is pending for restyling. r=emilio

MozReview-Commit-ID: DXcodMcQP59

--HG--
extra : rebase_source : e31ed0d2471150bfdf30ac656f39795d11a4fed5
---
 layout/base/ServoRestyleManager.cpp | 6 ++++++
 layout/base/ServoRestyleManager.h   | 1 +
 layout/style/ServoBindingList.h     | 4 ++++
 3 files changed, 11 insertions(+)

diff --git a/layout/base/ServoRestyleManager.cpp b/layout/base/ServoRestyleManager.cpp
index 830747faf5d2..90037333f08e 100644
--- a/layout/base/ServoRestyleManager.cpp
+++ b/layout/base/ServoRestyleManager.cpp
@@ -1202,6 +1202,12 @@ ServoRestyleManager::ProcessAllPendingAttributeAndStateInvalidations()
   ClearSnapshots();
 }
 
+bool
+ServoRestyleManager::HasPendingRestyleAncestor(Element* aElement) const
+{
+  return Servo_HasPendingRestyleAncestor(aElement);
+}
+
 void
 ServoRestyleManager::UpdateOnlyAnimationStyles()
 {
diff --git a/layout/base/ServoRestyleManager.h b/layout/base/ServoRestyleManager.h
index f9ac36fadb3b..9fb16d1fe17b 100644
--- a/layout/base/ServoRestyleManager.h
+++ b/layout/base/ServoRestyleManager.h
@@ -188,6 +188,7 @@ public:
                                     nsRestyleHint aRestyleHint);
   void ProcessPendingRestyles();
   void ProcessAllPendingAttributeAndStateInvalidations();
+  bool HasPendingRestyleAncestor(dom::Element* aElement) const;
 
   /**
    * Performs a Servo animation-only traversal to compute style for all nodes
diff --git a/layout/style/ServoBindingList.h b/layout/style/ServoBindingList.h
index 72de40f133c5..8e0bd8a0e6e5 100644
--- a/layout/style/ServoBindingList.h
+++ b/layout/style/ServoBindingList.h
@@ -646,6 +646,10 @@ SERVO_BINDING_FUNC(Servo_ProcessInvalidations, void,
                    const mozilla::ServoElementSnapshotTable* snapshots)
 
 
+SERVO_BINDING_FUNC(Servo_HasPendingRestyleAncestor, bool,
+                   RawGeckoElementBorrowed element)
+
+
 // AddRef / Release functions
 #define SERVO_ARC_TYPE(name_, type_)                                \
   SERVO_BINDING_FUNC(Servo_##name_##_AddRef, void, type_##Borrowed) \