Bug 1556657 - SHistoryParent::RecvFindEntryForBFCache should fill in all its outparams. r=annyG

Differential Revision: https://phabricator.services.mozilla.com/D33607

--HG--
extra : rebase_source : a869e6e0d2e1dfc19431f01eab257ef4ce88fabd
extra : source : b82e5b8c6964ab446abafc8be6017f4e15725d26
extra : histedit_source : b9c0a9c7462f0d984ae8d297aa8d51d80dcc02a6

docshell/shistory/SHistoryParent.cpp

@@ -194,14 +194,17 @@ bool SHistoryParent::RecvFindEntryForBFCache(const uint64_t& aSharedID,
         aSharedID) {
       if (!aIncludeCurrentEntry && i == currentIndex) {
         *aEntry = (PSHEntryParent*)nullptr;
+        *aIndex = -1;
       } else {
         SHEntryParent::GetOrCreate(Manager(), entry, *aEntry);
+        *aIndex = i;
       }
 
       return true;
     }
   }
   *aEntry = (PSHEntryParent*)nullptr;
+  *aIndex = -1;
   return true;
 }