Hang Monitor UMA

content/browser/renderer_host/render_widget_host_impl.h

 // Copyright (c) 2012 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_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 714 matching lines @@
   // Starts a hang monitor timeout. If there's already a hang monitor timeout
   // the new one will only fire if it has a shorter delay than the time
   // left on the existing timeouts.
   void StartHangMonitorTimeout(base::TimeDelta delay,
                                blink::WebInputEvent::Type event_type);
 
   // Stops all existing hang monitor timeouts and assumes the renderer is
   // responsive.
   void StopHangMonitorTimeout();
 
+  // Used for UMA logging how long the renderer was unresponsive.
+  void LogHangMonitorUnresponsive();
+
   // true if a renderer has once been valid. We use this flag to display a sad
   // tab only when we lose our renderer and not if a paint occurs during
   // initialization.
   bool renderer_initialized_;
 
   // True if |Destroy()| has been called.
   bool destroyed_;
 
   // Our delegate, which wants to know mainly about keyboard events.
   // It will remain non-NULL until DetachDelegate() is called.
@@ skipping 68 matching lines @@
   // by the renderer.
   int in_flight_event_count_;
 
   // Flag to detect recursive calls to GetBackingStore().
   bool in_get_backing_store_;
 
   // Used for UMA histogram logging to measure the time for a repaint view
   // operation to finish.
   base::TimeTicks repaint_start_time_;
 
+  // Used for UMA histogram logging to measure how long the renderer is hanging.
+  base::TimeTicks hang_start_time_;
+
   // Set to true if we shouldn't send input events from the render widget.
   bool ignore_input_events_;
 
   // Set when we update the text direction of the selected input element.
   bool text_direction_updated_;
   blink::WebTextDirection text_direction_;
 
   // Set when we cancel updating the text direction.
   // This flag also ignores succeeding update requests until we call
   // NotifyTextDirection().
@@ skipping 109 matching lines @@
   uint32_t last_compositor_frame_sink_id_ = 0;
 
   base::WeakPtrFactory<RenderWidgetHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_