Invoke trace callback even when trace buffer is full

base/debug/trace_event_impl.cc

Index: base/debug/trace_event_impl.cc
diff --git a/base/debug/trace_event_impl.cc b/base/debug/trace_event_impl.cc
index 860d989489488b8407292b3ba9169926e39e7463..38a6c0fe311df6ae92f716559d939b19d318de28 100644
--- a/base/debug/trace_event_impl.cc
+++ b/base/debug/trace_event_impl.cc
@@ -1000,12 +1000,14 @@ void TraceLog::AddTraceEventWithThreadIdAndTimestamp(
 
   NotificationHelper notifier(this);
 
-  {
+  do {
     AutoLock lock(lock_);
     if (*category_group_enabled != CATEGORY_ENABLED)
       return;
+
+    event_callback_copy = event_callback_;
     if (logged_events_->IsFull())
-      return;
+      break;
 
     const char* new_name = ThreadIdNameManager::GetInstance()->
         GetName(thread_id);
@@ -1047,9 +1049,7 @@ void TraceLog::AddTraceEventWithThreadIdAndTimestamp(
 
     if (watch_category_ == category_group_enabled && watch_event_name_ == name)
       notifier.AddNotificationWhileLocked(EVENT_WATCH_NOTIFICATION);
-
-    event_callback_copy = event_callback_;
-  }  // release lock
+  } while (0); // release lock
 
   notifier.SendNotificationIfAny();
   if (event_callback_copy != NULL) {