Tracing: Added some temp debug prints to investigate crbug.com/638744

base/trace_event/trace_log.cc

Index: base/trace_event/trace_log.cc
diff --git a/base/trace_event/trace_log.cc b/base/trace_event/trace_log.cc
index 872cd172b2b7310ef81b40befb90c06a3e7d5a90..0c9ff0574bc8f64c0e8381fb004916c63b050daa 100644
--- a/base/trace_event/trace_log.cc
+++ b/base/trace_event/trace_log.cc
@@ -1467,6 +1467,18 @@ void TraceLog::UpdateTraceEventDuration(
     TraceEvent* trace_event = GetEventByHandleInternal(handle, &lock);
     if (trace_event) {
       DCHECK(trace_event->phase() == TRACE_EVENT_PHASE_COMPLETE);
+      // TEMP(oysteine) to debug crbug.com/638744
+      if (trace_event->duration().ToInternalValue() != -1) {
+        DVLOG(1) << "TraceHandle: chunk_seq " << handle.chunk_seq
+                 << ", chunk_index " << handle.chunk_index << ", event_index "
+                 << handle.event_index;
+
+        std::string serialized_event;
+        trace_event->AppendAsJSON(&serialized_event, ArgumentFilterPredicate());
+        DVLOG(1) << "TraceEvent: " << serialized_event;
+        lock_.AssertAcquired();
+      }
+
       trace_event->UpdateDuration(now, thread_now);
 #if defined(OS_ANDROID)
       trace_event->SendToATrace();