Comment out the CHECK for trace_id for now

ui/events/latency_info.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/debug/trace_event.h"
 #include "base/json/json_writer.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/stringprintf.h"
 #include "ui/events/latency_info.h"
 
@@ skipping 136 matching lines @@
 }
 
 void LatencyInfo::AddLatencyNumberWithTimestamp(LatencyComponentType component,
                                                 int64 id,
                                                 int64 component_sequence_number,
                                                 base::TimeTicks time,
                                                 uint32 event_count,
                                                 bool dump_to_trace) {
   if (dump_to_trace && IsBeginComponent(component)) {
     // Should only ever add begin component once.
-    CHECK_EQ(-1, trace_id);
+    // Put the CHECK back once crbug.com/321116 is resolved.
+    // CHECK_EQ(-1, trace_id);
     trace_id = component_sequence_number;
     TRACE_EVENT_ASYNC_BEGIN0("benchmark",
                              "InputLatency",
                              TRACE_ID_DONT_MANGLE(trace_id));
   }
 
   LatencyMap::key_type key = std::make_pair(component, id);
   LatencyMap::iterator it = latency_components.find(key);
   if (it == latency_components.end()) {
     LatencyComponent info = {component_sequence_number, time, event_count};
@@ skipping 33 matching lines @@
   if (output)
     *output = it->second;
   return true;
 }
 
 void LatencyInfo::Clear() {
   latency_components.clear();
 }
 
 }  // namespace ui