diff --git a/mozilla/xpcom/public/nsIEventQueue.h b/mozilla/xpcom/public/nsIEventQueue.h
index 9d153f6c94a..cd7d1394260 100644
--- a/mozilla/xpcom/public/nsIEventQueue.h
+++ b/mozilla/xpcom/public/nsIEventQueue.h
@@ -38,8 +38,10 @@ public:
 	static const nsIID& GetIID() { static nsIID iid = NS_IEVENTQUEUE_IID; return iid;}
 
   NS_IMETHOD_(PRStatus) PostEvent(PLEvent* aEvent) = 0;
-  NS_IMETHOD PostSynchronousEvent(PLEvent* aEvent) = 0;
-	NS_IMETHOD ProcessPendingEvents() = 0;
+  NS_IMETHOD PostSynchronousEvent(PLEvent* aEvent, void** aResult) = 0;
+	
+  NS_IMETHOD ProcessPendingEvents() = 0;
+  NS_IMETHOD EventLoop() = 0;
 
 	NS_IMETHOD EventAvailable(PRBool& aResult) = 0;
 	NS_IMETHOD GetEvent(PLEvent** aResult) = 0;
diff --git a/mozilla/xpcom/src/nsEventQueue.cpp b/mozilla/xpcom/src/nsEventQueue.cpp
index 99c3aeb7324..b4981790eeb 100644
--- a/mozilla/xpcom/src/nsEventQueue.cpp
+++ b/mozilla/xpcom/src/nsEventQueue.cpp
@@ -60,10 +60,14 @@ nsEventQueueImpl::PostEvent(PLEvent* aEvent)
 }
 
 NS_IMETHODIMP
-nsEventQueueImpl::PostSynchronousEvent(PLEvent* aEvent)
+nsEventQueueImpl::PostSynchronousEvent(PLEvent* aEvent, void** aResult)
 {
-	PL_PostSynchronousEvent(mEventQueue, aEvent);
-	return NS_OK;
+  void* result = PL_PostSynchronousEvent(mEventQueue, aEvent);
+	if (aResult)
+  {
+    *aResult = result;
+  }
+  return NS_OK;
 }
 
 NS_IMETHODIMP
@@ -73,6 +77,13 @@ nsEventQueueImpl::ProcessPendingEvents()
 	return NS_OK;
 }
 
+NS_IMETHODIMP
+nsEventQueueImpl::EventLoop()
+{
+  PL_EventLoop(mEventQueue);
+  return NS_OK;
+}
+
 NS_IMETHODIMP
 nsEventQueueImpl::EventAvailable(PRBool& aResult)
 {
diff --git a/mozilla/xpcom/src/nsEventQueue.h b/mozilla/xpcom/src/nsEventQueue.h
index 8c323013302..23f5f1fb457 100644
--- a/mozilla/xpcom/src/nsEventQueue.h
+++ b/mozilla/xpcom/src/nsEventQueue.h
@@ -33,9 +33,12 @@ public:
 
   // nsIEventQueue interface...
 	NS_IMETHOD_(PRStatus) PostEvent(PLEvent* aEvent);
-	NS_IMETHOD PostSynchronousEvent(PLEvent* aEvent);
+	NS_IMETHOD PostSynchronousEvent(PLEvent* aEvent, void** aResult);
+
   NS_IMETHOD ProcessPendingEvents();
-	NS_IMETHOD EventAvailable(PRBool& aResult);
+	NS_IMETHOD EventLoop();
+
+  NS_IMETHOD EventAvailable(PRBool& aResult);
 	NS_IMETHOD GetEvent(PLEvent** aResult);
 
   NS_IMETHOD_(PRInt32) GetEventQueueSelectFD();
diff --git a/mozilla/xpcom/threads/nsEventQueue.cpp b/mozilla/xpcom/threads/nsEventQueue.cpp
index 99c3aeb7324..b4981790eeb 100644
--- a/mozilla/xpcom/threads/nsEventQueue.cpp
+++ b/mozilla/xpcom/threads/nsEventQueue.cpp
@@ -60,10 +60,14 @@ nsEventQueueImpl::PostEvent(PLEvent* aEvent)
 }
 
 NS_IMETHODIMP
-nsEventQueueImpl::PostSynchronousEvent(PLEvent* aEvent)
+nsEventQueueImpl::PostSynchronousEvent(PLEvent* aEvent, void** aResult)
 {
-	PL_PostSynchronousEvent(mEventQueue, aEvent);
-	return NS_OK;
+  void* result = PL_PostSynchronousEvent(mEventQueue, aEvent);
+	if (aResult)
+  {
+    *aResult = result;
+  }
+  return NS_OK;
 }
 
 NS_IMETHODIMP
@@ -73,6 +77,13 @@ nsEventQueueImpl::ProcessPendingEvents()
 	return NS_OK;
 }
 
+NS_IMETHODIMP
+nsEventQueueImpl::EventLoop()
+{
+  PL_EventLoop(mEventQueue);
+  return NS_OK;
+}
+
 NS_IMETHODIMP
 nsEventQueueImpl::EventAvailable(PRBool& aResult)
 {
diff --git a/mozilla/xpcom/threads/nsEventQueue.h b/mozilla/xpcom/threads/nsEventQueue.h
index 8c323013302..23f5f1fb457 100644
--- a/mozilla/xpcom/threads/nsEventQueue.h
+++ b/mozilla/xpcom/threads/nsEventQueue.h
@@ -33,9 +33,12 @@ public:
 
   // nsIEventQueue interface...
 	NS_IMETHOD_(PRStatus) PostEvent(PLEvent* aEvent);
-	NS_IMETHOD PostSynchronousEvent(PLEvent* aEvent);
+	NS_IMETHOD PostSynchronousEvent(PLEvent* aEvent, void** aResult);
+
   NS_IMETHOD ProcessPendingEvents();
-	NS_IMETHOD EventAvailable(PRBool& aResult);
+	NS_IMETHOD EventLoop();
+
+  NS_IMETHOD EventAvailable(PRBool& aResult);
 	NS_IMETHOD GetEvent(PLEvent** aResult);
 
   NS_IMETHOD_(PRInt32) GetEventQueueSelectFD();
diff --git a/mozilla/xpcom/threads/nsIEventQueue.h b/mozilla/xpcom/threads/nsIEventQueue.h
index 9d153f6c94a..cd7d1394260 100644
--- a/mozilla/xpcom/threads/nsIEventQueue.h
+++ b/mozilla/xpcom/threads/nsIEventQueue.h
@@ -38,8 +38,10 @@ public:
 	static const nsIID& GetIID() { static nsIID iid = NS_IEVENTQUEUE_IID; return iid;}
 
   NS_IMETHOD_(PRStatus) PostEvent(PLEvent* aEvent) = 0;
-  NS_IMETHOD PostSynchronousEvent(PLEvent* aEvent) = 0;
-	NS_IMETHOD ProcessPendingEvents() = 0;
+  NS_IMETHOD PostSynchronousEvent(PLEvent* aEvent, void** aResult) = 0;
+	
+  NS_IMETHOD ProcessPendingEvents() = 0;
+  NS_IMETHOD EventLoop() = 0;
 
 	NS_IMETHOD EventAvailable(PRBool& aResult) = 0;
 	NS_IMETHOD GetEvent(PLEvent** aResult) = 0;