Forcibly clear worker ref counts on shutdown.

content/browser/renderer_host/render_process_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_PROCESS_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_PROCESS_HOST_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 155 matching lines @@
   void NotifyTimezoneChange(const std::string& timezone) override;
   shell::InterfaceProvider* GetRemoteInterfaces() override;
   std::unique_ptr<base::SharedPersistentMemoryAllocator> TakeMetricsAllocator()
       override;
   const base::TimeTicks& GetInitTimeForNavigationMetrics() const override;
 #if defined(ENABLE_BROWSER_CDMS)
   scoped_refptr<media::MediaKeys> GetCdm(int render_frame_id,
                                          int cdm_id) const override;
 #endif
   bool IsProcessBackgrounded() const override;
+

[jam, 2016/09/14 17:10:49]

nit: undo this blank line (we don't add empty lines between overridden methods)

[falken, 2016/09/21 08:59:43]

Who knew! Done.

   void IncrementServiceWorkerRefCount() override;
   void DecrementServiceWorkerRefCount() override;
   void IncrementSharedWorkerRefCount() override;
   void DecrementSharedWorkerRefCount() override;
+  void ForceReleaseWorkerRefCounts() override;
+  bool IsWorkerRefCountDisabled() override;
+
   void PurgeAndSuspend() override;
 
   // IPC::Sender via RenderProcessHost.
   bool Send(IPC::Message* msg) override;
 
   // IPC::Listener via RenderProcessHost.
   bool OnMessageReceived(const IPC::Message& msg) override;
   void OnChannelConnected(int32_t peer_pid) override;
   void OnChannelError() override;
   void OnBadMessageReceived(const IPC::Message& message) override;
@@ skipping 229 matching lines @@
   int connection_filter_id_ = MojoShellConnection::kInvalidConnectionFilterId;
   scoped_refptr<ConnectionFilterController> connection_filter_controller_;
   shell::mojom::ServicePtr test_service_;
 #if defined(OS_ANDROID)
   std::unique_ptr<InterfaceRegistryAndroid> interface_registry_android_;
 #endif
 
   size_t service_worker_ref_count_;
   size_t shared_worker_ref_count_;
 
+  // Set in ForceReleaseWorkerRefCounts. When true, worker ref counts must no
+  // longer be modified.
+  bool is_worker_ref_count_disabled_;
+
   // The registered IPC listener objects. When this list is empty, we should
   // delete ourselves.
   IDMap<IPC::Listener> listeners_;
 
   // The count of currently visible widgets.  Since the host can be a container
   // for multiple widgets, it uses this count to determine when it should be
   // backgrounded.
   int32_t visible_widgets_;
 
   // Whether this process currently has backgrounded priority. Tracked so that
@@ skipping 142 matching lines @@
       instance_weak_factory_;
 
   base::WeakPtrFactory<RenderProcessHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderProcessHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_PROCESS_HOST_IMPL_H_