Bug 597315 Part 1 (session history) - Frameset history does not work properly when restoring a tab [r=bz, a=blocking2.0:betaN+]

docshell/shistory/public/nsISHistory.idl

@@ -178,3 +178,9 @@ interface nsISHistory: nsISupports
    */
    readonly attribute nsISimpleEnumerator SHistoryEnumerator;
 };
+
+[scriptable, uuid(ac8b3eb3-2051-4cce-8303-d6e7938501dd)]
+interface nsISHistory_2_0_BRANCH: nsISHistory
+{
+  void reloadCurrentEntry();
+};

docshell/shistory/src/nsSHistory.cpp

@@ -153,6 +153,7 @@ NS_INTERFACE_MAP_BEGIN(nsSHistory)
    NS_INTERFACE_MAP_ENTRY(nsISHistory)
    NS_INTERFACE_MAP_ENTRY(nsIWebNavigation)
    NS_INTERFACE_MAP_ENTRY(nsISHistoryInternal)
+   NS_INTERFACE_MAP_ENTRY(nsISHistory_2_0_BRANCH)
 NS_INTERFACE_MAP_END
 
 //*****************************************************************************
@@ -796,6 +797,25 @@ nsSHistory::Reload(PRUint32 aReloadFlags)
   return LoadEntry(mIndex, loadType, HIST_CMD_RELOAD);
 }
 
+NS_IMETHODIMP
+nsSHistory::ReloadCurrentEntry()
+{
+  // Notify listeners
+  PRBool canNavigate = PR_TRUE;
+  if (mListener) {
+    nsCOMPtr<nsISHistoryListener> listener(do_QueryReferent(mListener));
+    if (listener) {
+      nsCOMPtr<nsIURI> currentURI;
+      GetCurrentURI(getter_AddRefs(currentURI));
+      listener->OnHistoryGotoIndex(mIndex, currentURI, &canNavigate);
+    }
+  }
+  if (!canNavigate)
+    return NS_OK;
+
+  return LoadEntry(mIndex, nsIDocShellLoadInfo::loadHistory, HIST_CMD_RELOAD);
+}
+
 void
 nsSHistory::EvictWindowContentViewers(PRInt32 aFromIndex, PRInt32 aToIndex)
 {

docshell/shistory/src/nsSHistory.h

@@ -62,7 +62,7 @@ class nsIDocShell;
 class nsSHEnumerator;
 class nsSHistoryObserver;
 class nsSHistory: public PRCList,
-                  public nsISHistory,
+                  public nsISHistory_2_0_BRANCH,
                   public nsISHistoryInternal,
                   public nsIWebNavigation
 {
@@ -73,6 +73,7 @@ public:
   NS_DECL_NSISHISTORY
   NS_DECL_NSISHISTORYINTERNAL
   NS_DECL_NSIWEBNAVIGATION
+  NS_DECL_NSISHISTORY_2_0_BRANCH
 
   // One time initialization method called upon docshell module construction
   static nsresult Startup();