add accessor for getting the account manager from the mail session

mailnews/base/public/nsIMsgMailSession.h

@@ -43,6 +43,7 @@
 
 #include "nsIMsgIdentity.h"
 #include "nsIMsgIncomingServer.h"
+#include "nsIMsgAccountManager.h"
 
 class nsIMsgMailSession : public nsISupports
 {
@@ -56,6 +57,7 @@ public:
 
 	NS_IMETHOD GetCurrentIdentity(nsIMsgIdentity ** aIdentity) = 0;
     NS_IMETHOD GetCurrentServer(nsIMsgIncomingServer* *aServer) = 0;
+    NS_IMETHOD GetAccountManager(nsIMsgAccountManager* *aAccountManager) = 0;
 };
 
 #endif /* nsIMsgMailSession_h___ */

mailnews/base/src/nsMsgMailSession.cpp

@@ -87,3 +87,12 @@ nsresult nsMsgMailSession::GetCurrentServer(nsIMsgIncomingServer ** aServer)
 
   return rv;
 }
+
+nsresult nsMsgMailSession::GetAccountManager(nsIMsgAccountManager* *aAM)
+{
+  if (!aAM) return NS_ERROR_NULL_POINTER;
+  
+  *aAM = m_accountManager;
+  NS_ADDREF(m_accountManager);
+  return NS_OK;
+}

mailnews/base/src/nsMsgMailSession.h

@@ -44,6 +44,7 @@ public:
 	// nsIMsgMailSession support
 	NS_IMETHOD GetCurrentIdentity(nsIMsgIdentity ** aIdentity);
     NS_IMETHOD GetCurrentServer(nsIMsgIncomingServer **aServer);
+    NS_IMETHOD GetAccountManager(nsIMsgAccountManager* *aAM);
   
 protected:
   nsIMsgAccountManager *m_accountManager;