Only terminate latency components when no rendering is scheduled

content/browser/renderer_host/render_widget_host_latency_tracker.h

 // 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_LATENCY_TRACKER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_LATENCY_TRACKER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "content/browser/renderer_host/event_with_latency_info.h"
+#include "content/common/content_export.h"
 #include "ui/events/latency_info.h"
 
 namespace content {
 
 // Utility class for tracking the latency of events passing through
 // a given RenderWidgetHost.
-class RenderWidgetHostLatencyTracker {
+class CONTENT_EXPORT RenderWidgetHostLatencyTracker {
  public:
   RenderWidgetHostLatencyTracker();
   ~RenderWidgetHostLatencyTracker();
 
   // Associates the latency tracker with a given route and process.
   // Called once after the RenderWidgetHost is fully initialized.
   void Initialize(int routing_id, int process_id);
 
   // Populates the LatencyInfo with relevant entries for latency tracking.
   // Called when an event is received by the RenderWidgetHost, prior to
@@ skipping 32 matching lines @@
   int64 last_event_id_;
   int64 latency_component_id_;
   float device_scale_factor_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostLatencyTracker);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_LATENCY_TRACKER_H_