Bug 1390694 - Part 3: Add nsBindingManager function to check for document state dependencies. r=emilio

MozReview-Commit-ID: Aw04MrVHyIz

--HG--
extra : rebase_source : dd1e15f0589ec532111711e14348c6d2ee590314

dom/xbl/nsBindingManager.cpp

@@ -1169,3 +1169,20 @@ nsBindingManager::FindNestedSingleInsertionPoint(nsIContent* aContainer,
 
   return parent;
 }
+
+bool
+nsBindingManager::AnyBindingHasDocumentStateDependency(EventStates aStateMask)
+{
+  MOZ_ASSERT(mDocument->IsStyledByServo());
+
+  bool result = false;
+  EnumerateBoundContentBindings([&](nsXBLBinding* aBinding) {
+    ServoStyleSet* styleSet = aBinding->PrototypeBinding()->GetServoStyleSet();
+    if (styleSet && styleSet->HasDocumentStateDependency(aStateMask)) {
+      result = true;
+      return false;
+    }
+    return true;
+  });
+  return result;
+}

dom/xbl/nsBindingManager.h

@@ -19,6 +19,7 @@
 #include "nsTArray.h"
 #include "nsThreadUtils.h"
 #include "mozilla/StyleSheet.h"
+#include "mozilla/EventStates.h"
 
 struct ElementDependentRuleProcessorData;
 class nsIXPConnectWrappedJS;
@@ -175,6 +176,8 @@ public:
 
   nsIContent* FindNestedSingleInsertionPoint(nsIContent* aContainer, bool* aMulti);
 
+  bool AnyBindingHasDocumentStateDependency(mozilla::EventStates aStateMask);
+
 protected:
   nsIXPConnectWrappedJS* GetWrappedJS(nsIContent* aContent);
   nsresult SetWrappedJS(nsIContent* aContent, nsIXPConnectWrappedJS* aResult);