Added Get/Set methods to content IDs. An ID is used as a key to store state information about a content object and its associated frame object. The state information is stored in a dictionary that is manipulated by the frame manager (nsIFrameManager) inside layout. An opaque pointer to this dictionary is passed to the session history as a handle associated with the current document's state.

git-svn-id: svn://10.0.0.236/trunk@45321 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/content/base/src/nsCommentNode.cpp

@@ -151,6 +151,16 @@ public:
                             nsIDOMEvent** aDOMEvent,
                             PRUint32 aFlags,
                             nsEventStatus& aEventStatus);
+
+  NS_IMETHOD GetContentID(PRUint32* aID) {
+    *aID = mContentID;
+    return NS_OK;
+  }
+  NS_IMETHOD SetContentID(PRUint32 aID) {
+    mContentID = aID;
+    return NS_OK;
+  }
+
   NS_IMETHOD RangeAdd(nsIDOMRange& aRange){
     return mInner.RangeAdd(aRange);
   }
@@ -181,6 +191,7 @@ public:
 
 protected:
   nsGenericDOMDataNode mInner;
+  PRUint32 mContentID;
 };
 
 nsresult NS_NewCommentNode(nsIContent** aInstancePtrResult);
@@ -202,6 +213,7 @@ nsCommentNode::nsCommentNode()
 {
   NS_INIT_REFCNT();
   mInner.Init(this);
+  mContentID = 0;
 }
 
 nsCommentNode::~nsCommentNode()