Delay the DidComposite call in ClientLayerManager's destructor. (bug 1305829, r=mattwoodrow)

gfx/layers/client/ClientLayerManager.cpp

@@ -112,8 +112,15 @@ ClientLayerManager::ClientLayerManager(nsIWidget* aWidget)
 ClientLayerManager::~ClientLayerManager()
 {
   if (mTransactionIdAllocator) {
-    TimeStamp now = TimeStamp::Now();
-    DidComposite(mLatestTransactionId, now, now);
+    // Make sure to notify the refresh driver just in case it's waiting on a
+    // pending transaction.
+    RefPtr<TransactionIdAllocator> allocator = mTransactionIdAllocator;
+    uint64_t id = mLatestTransactionId;
+
+    RefPtr<Runnable> task = NS_NewRunnableFunction([allocator, id] () -> void {
+      allocator->NotifyTransactionCompleted(id);
+    });
+    NS_DispatchToMainThread(task.forget());
   }
   mMemoryPressureObserver->Destroy();
   ClearCachedResources();