Maintain the current renderer_hang_count in Stability.Counts.

content/browser/renderer_host/render_view_host_impl.cc

 // 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.
 
 #include "content/browser/renderer_host/render_view_host_impl.h"
 
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 938 matching lines @@
   } else {
     render_view_ready_on_process_launch_ = true;
   }
 }
 
 void RenderViewHostImpl::RenderViewReady() {
   delegate_->RenderViewReady(this);
 }
 
 void RenderViewHostImpl::ClosePageTimeout() {
+  // Temporarily fire "hung" events to keep the renderer_hang_count from
+  // Stability.Counts stable.
+  NotificationService::current()->Notify(NOTIFICATION_RENDER_WIDGET_HOST_HANG,
+                                         Source<RenderWidgetHost>(nullptr),
+                                         NotificationService::NoDetails());
+
   if (delegate_->ShouldIgnoreUnresponsiveRenderer())
     return;
 
   UMA_HISTOGRAM_ENUMERATION(
       "ChildProcess.HangRendererType",
       RendererUnresponsiveType::RENDERER_UNRESPONSIVE_CLOSE_PAGE,
       RendererUnresponsiveType::RENDERER_UNRESPONSIVE_MAX);
 
   ClosePageIgnoringUnloadEvents();
 }
 
 }  // namespace content