Do not log Display Compositor latency component twice.

content/browser/renderer_host/input/render_widget_host_latency_tracker.cc

 // Copyright 2014 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 "content/browser/renderer_host/input/render_widget_host_latency_tracker.h"
 
 #include <stddef.h>
 
 #include "base/logging.h"
 #include "base/metrics/histogram_functions.h"
@@ skipping 263 matching lines @@
 
   ComputeInputLatencyHistograms(event.GetType(), latency_component_id_,
                                 *latency, ack_result);
 }
 
 void RenderWidgetHostLatencyTracker::OnSwapCompositorFrame(
     std::vector<LatencyInfo>* latencies) {
   DCHECK(latencies);
   for (LatencyInfo& latency : *latencies) {
     AddLatencyInfoComponentIds(&latency, latency_component_id_);
-    latency.AddLatencyNumber(ui::DISPLAY_COMPOSITOR_RECEIVED_FRAME_COMPONENT, 0,
-                             0);
   }
 }
 
 void RenderWidgetHostLatencyTracker::SetDelegate(
     RenderWidgetHostDelegate* delegate) {
   render_widget_host_delegate_ = delegate;
 }
 
 void RenderWidgetHostLatencyTracker::ReportRapporScrollLatency(
     const std::string& name,
     const LatencyInfo::LatencyComponent& start_component,
     const LatencyInfo::LatencyComponent& end_component) {
   CONFIRM_VALID_TIMING(start_component, end_component)
   rappor::RapporService* rappor_service =
       GetContentClient()->browser()->GetRapporService();
   if (rappor_service && render_widget_host_delegate_) {
     std::unique_ptr<rappor::Sample> sample =
         rappor_service->CreateSample(rappor::UMA_RAPPOR_TYPE);
     render_widget_host_delegate_->AddDomainInfoToRapporSample(sample.get());
     sample->SetUInt64Field(
         "Latency",
         (end_component.last_event_time - start_component.first_event_time)
             .InMicroseconds(),
         rappor::NO_NOISE);
     rappor_service->RecordSample(name, std::move(sample));
   }
 }
 
 }  // namespace content