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diff --git a/content/browser/debugger/worker_devtools_manager.h b/content/browser/debugger/worker_devtools_manager.h
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+++ b/content/browser/debugger/worker_devtools_manager.h
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+// 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_DEBUGGER_WORKER_DEVTOOLS_MANAGER_H_
+#define CONTENT_BROWSER_DEBUGGER_WORKER_DEVTOOLS_MANAGER_H_
+
+#include <list>
+#include <map>
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/memory/singleton.h"
+#include "content/common/content_export.h"
+#include "content/browser/worker_host/worker_process_host.h"
+
+namespace content {
+
+class DevToolsAgentHost;
+
+// All methods are supposed to be called on the IO thread.
+class WorkerDevToolsManager {
+ public:
+  // Returns the WorkerDevToolsManager singleton.
+  static WorkerDevToolsManager* GetInstance();
+
+  // Called on the UI thread.
+  static DevToolsAgentHost* GetDevToolsAgentHostForWorker(
+      int worker_process_id,
+      int worker_route_id);
+
+  void ForwardToDevToolsClient(int worker_process_id,
+                               int worker_route_id,
+                               const std::string& message);
+  void SaveAgentRuntimeState(int worker_process_id,
+                             int worker_route_id,
+                             const std::string& state);
+
+  // Called on the IO thread.
+  void WorkerCreated(
+      WorkerProcessHost* process,
+      const WorkerProcessHost::WorkerInstance& instance);
+  void WorkerDestroyed(WorkerProcessHost* process, int worker_route_id);
+  void WorkerContextStarted(WorkerProcessHost* process, int worker_route_id);
+
+ private:
+  friend struct DefaultSingletonTraits<WorkerDevToolsManager>;
+  typedef std::pair<int, int> WorkerId;
+  class AgentHosts;
+  class DetachedClientHosts;
+  class WorkerDevToolsAgentHost;
+  struct InspectedWorker;
+  typedef std::list<InspectedWorker> InspectedWorkersList;
+
+  WorkerDevToolsManager();
+  virtual ~WorkerDevToolsManager();
+
+  void RemoveInspectedWorkerData(const WorkerId& id);
+  InspectedWorkersList::iterator FindInspectedWorker(int host_id, int route_id);
+
+  void RegisterDevToolsAgentHostForWorker(int worker_process_id,
+                                          int worker_route_id);
+  void ForwardToWorkerDevToolsAgent(int worker_process_host_id,
+                                    int worker_route_id,
+                                    const IPC::Message& message);
+  static void ForwardToDevToolsClientOnUIThread(
+      int worker_process_id,
+      int worker_route_id,
+      const std::string& message);
+  static void SaveAgentRuntimeStateOnUIThread(
+      int worker_process_id,
+      int worker_route_id,
+      const std::string& state);
+  static void NotifyWorkerDestroyedOnIOThread(int worker_process_id,
+                                              int worker_route_id);
+  static void NotifyWorkerDestroyedOnUIThread(int worker_process_id,
+                                              int worker_route_id);
+  static void SendResumeToWorker(const WorkerId& id);
+
+  InspectedWorkersList inspected_workers_;
+
+  struct TerminatedInspectedWorker;
+  typedef std::list<TerminatedInspectedWorker> TerminatedInspectedWorkers;
+  // List of terminated workers for which there may be a devtools client on
+  // the UI thread. Worker entry is added into this list when inspected worker
+  // is terminated and will be removed in one of two cases:
+  // - shared worker with the same URL and name is started(in wich case we will
+  // try to reattach existing DevTools client to the new worker).
+  // - DevTools client which was inspecting terminated worker is closed on the
+  // UI thread and and WorkerDevToolsManager is notified about that on the IO
+  // thread.
+  TerminatedInspectedWorkers terminated_workers_;
+
+  typedef std::map<WorkerId, WorkerId> PausedWorkers;
+  // Map from old to new worker id for the inspected workers that have been
+  // terminated and started again in paused state. Worker data will be removed
+  // from this list in one of two cases:
+  // - DevTools client is closed on the UI thread, WorkerDevToolsManager was
+  // notified about that on the IO thread and sent "resume" message to the
+  // worker.
+  // - Existing DevTools client was reattached to the new worker.
+  PausedWorkers paused_workers_;
+
+  DISALLOW_COPY_AND_ASSIGN(WorkerDevToolsManager);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_DEBUGGER_WORKER_DEVTOOLS_MANAGER_H_