Bug 1026580 - Remove an infinite loop possibility from AsyncTransactionTracker::WaitComplete() r=nical

gfx/layers/ipc/AsyncTransactionTracker.cpp

@@ -33,16 +33,21 @@ AsyncTransactionTracker::WaitComplete()
 
   MonitorAutoLock mon(mCompletedMonitor);
   int count = 0;
-  while (!mCompleted) {
+  const int maxCount = 5;
+  while (!mCompleted && (count < maxCount)) {
     if (!NS_SUCCEEDED(mCompletedMonitor.Wait(PR_MillisecondsToInterval(10000)))) {
       NS_WARNING("Failed to wait Monitor");
       return;
     }
     if (count > 1) {
-      NS_WARNING("Waiting async transaction complete.");
+      printf_stderr("Waiting async transaction complete.\n");
     }
     count++;
   }
+
+  if (!mCompleted) {
+    printf_stderr("Timeout of waiting transaction complete.");
+  }
 }
 
 void