Bug 1588489 - Fix for getting the BFCache ID from an entry in the parent process. r=annyG

Differential Revision: https://phabricator.services.mozilla.com/D49169

--HG--
extra : rebase_source : 5a095b1237a210e2ffcc6888f8271b8b5be6dd6b
extra : source : 7d400025faba588fe9a77103f151d6954a14ac13
extra : histedit_source : 55299b48422de0af4af8ae1712e08315fe2046a4

docshell/shistory/SHEntryParent.cpp

@@ -52,6 +52,12 @@ void LegacySHEntry::AbandonBFCacheEntry(uint64_t aNewSharedID) {
   mShared = shared.forget();
 }
 
+NS_IMETHODIMP
+LegacySHEntry::GetBfcacheID(uint64_t* aBFCacheID) {
+  *aBFCacheID = mShared->GetID();
+  return NS_OK;
+}
+
 void SHEntryParent::ActorDestroy(ActorDestroyReason aWhy) {
   mEntry->mActor = nullptr;
 }

docshell/shistory/SHEntryParent.h

@@ -56,6 +56,7 @@ class LegacySHEntry final : public nsSHEntry, public CrossProcessSHEntry {
 
   using nsSHEntry::AbandonBFCacheEntry;
   void AbandonBFCacheEntry(uint64_t aNewSharedID);
+  NS_IMETHODIMP GetBfcacheID(uint64_t* aBFCacheID) override;
 
   uint64_t GetSharedStateID() const { return mShared->GetID(); }