Fix hung renderer timer code in RenderWidgetHost (task spam bug)

content/browser/renderer_host/render_widget_host.h

Index: content/browser/renderer_host/render_widget_host.h
diff --git a/content/browser/renderer_host/render_widget_host.h b/content/browser/renderer_host/render_widget_host.h
index 539ddb3c0df08e8abe6549c0b51c5ac5ed6f4a9d..20899707ce61d9558fa7d724908e1f16b9247785 100644
--- a/content/browser/renderer_host/render_widget_host.h
+++ b/content/browser/renderer_host/render_widget_host.h
@@ -712,11 +712,13 @@ class CONTENT_EXPORT RenderWidgetHost : public IPC::Channel::Listener,
   // This is true if the renderer is currently unresponsive.
   bool is_unresponsive_;
 
-  // The following value indicates a time in the future when we would consider
-  // the renderer hung if it does not generate an appropriate response message.
-  base::Time time_when_considered_hung_;
+  // This is true if we are currently monitoring for a hung renderer.
+  bool is_monitoring_for_hung_renderer_;
 
-  // This timer runs to check if time_when_considered_hung_ has past.
+  // Last time we heard from the renderer.
+  base::TimeTicks time_of_last_renderer_response_;
+
+  // This timer runs to check if the renderer is unresponsive.
   base::OneShotTimer<RenderWidgetHost> hung_renderer_timer_;
 
   // Flag to detect recursive calls to GetBackingStore().