Hang Monitor UMA

content/browser/renderer_host/render_widget_host_impl.h

Index: content/browser/renderer_host/render_widget_host_impl.h
diff --git a/content/browser/renderer_host/render_widget_host_impl.h b/content/browser/renderer_host/render_widget_host_impl.h
index 74595277b72a72f3014793de422ea39ddfeee593..d7d76fde7c5962fd458406caac564ce07f84d31e 100644
--- a/content/browser/renderer_host/render_widget_host_impl.h
+++ b/content/browser/renderer_host/render_widget_host_impl.h
@@ -809,6 +809,9 @@ class CONTENT_EXPORT RenderWidgetHostImpl : public RenderWidgetHost,
   // 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_;