Maintain the current renderer_hang_count in Stability.Counts.

content/browser/frame_host/render_frame_host_impl.cc

 // Copyright 2013 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/frame_host/render_frame_host_impl.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 55 matching lines @@
 #include "content/common/render_message_filter.mojom.h"
 #include "content/common/renderer.mojom.h"
 #include "content/common/site_isolation_policy.h"
 #include "content/common/swapped_out_messages.h"
 #include "content/public/browser/ax_event_notification_details.h"
 #include "content/public/browser/browser_accessibility_state.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_plugin_guest_manager.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/content_browser_client.h"
+#include "content/public/browser/notification_service.h"
+#include "content/public/browser/notification_types.h"
 #include "content/public/browser/permission_manager.h"
 #include "content/public/browser/permission_type.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/resource_context.h"
 #include "content/public/browser/storage_partition.h"
 #include "content/public/browser/stream_handle.h"
 #include "content/public/browser/user_metrics.h"
 #include "content/public/common/bindings_policy.h"
 #include "content/public/common/browser_side_navigation_policy.h"
@@ skipping 3368 matching lines @@
   // There is no pending NavigationEntry in these cases, so pass 0 as the
   // pending_nav_entry_id. If the previous handle was a prematurely aborted
   // navigation loaded via LoadDataWithBaseURL, propagate the entry id.
   return NavigationHandleImpl::Create(
       params.url, params.redirects, frame_tree_node_, is_renderer_initiated,
       params.was_within_same_page, base::TimeTicks::Now(),
       entry_id_for_data_nav, false);  // started_from_context_menu
 }
 
 void RenderFrameHostImpl::BeforeUnloadTimeout() {
+  // 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 (render_view_host_->GetDelegate()->ShouldIgnoreUnresponsiveRenderer())
     return;
 
   UMA_HISTOGRAM_ENUMERATION(
       "ChildProcess.HangRendererType", beforeunload_timeout_type_,
       RendererUnresponsiveType::RENDERER_UNRESPONSIVE_MAX);
 
   SimulateBeforeUnloadAck();
 }
 
 }  // namespace content