[DevTools] Migrate from AgentStateCallbacks to DevToolsAgentHostObserver.

content/public/browser/devtools_agent_host.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_PUBLIC_BROWSER_DEVTOOLS_AGENT_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_DEVTOOLS_AGENT_HOST_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/devtools_agent_host_client.h"
+#include "content/public/browser/devtools_agent_host_observer.h"
 #include "url/gurl.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace net {
 class ServerSocket;
 }
 
@@ skipping 89 matching lines @@
       std::unique_ptr<DevToolsSocketFactory> server_socket_factory,
       const std::string& frontend_url,
       const base::FilePath& active_port_output_directory,
       const base::FilePath& debug_frontend_dir,
       const std::string& product_name,
       const std::string& user_agent);
 
   // Stops remote debugging.
   static void StopRemoteDebuggingServer();
 
+  // Observer is notified about changes in DevToolsAgentHosts.
+  static void AddObserver(DevToolsAgentHostObserver*);
+  static void RemoveObserver(DevToolsAgentHostObserver*);
+
   // Attaches |client| to this agent host to start debugging.
   // Returns true iff attach succeeded.
   virtual bool AttachClient(DevToolsAgentHostClient* client) = 0;
 
   // Attaches |client| to this agent host to start debugging. Disconnects
   // any existing clients.
   virtual void ForceAttachClient(DevToolsAgentHostClient* client) = 0;
 
   // Already attached client detaches from this agent host to stop debugging it.
   // Returns true iff detach succeeded.
@@ skipping 57 matching lines @@
 
   // Closes agent host. Returns false if the operation failed.
   virtual bool Close() = 0;
 
   // Returns the time when the host was last active.
   virtual base::TimeTicks GetLastActivityTime() = 0;
 
   // Terminates all debugging sessions and detaches all clients.
   static void DetachAllClients();
 
-  typedef base::Callback<void(DevToolsAgentHost*, bool attached)>
-      AgentStateCallback;
-
-  static void AddAgentStateCallback(const AgentStateCallback& callback);
-  static void RemoveAgentStateCallback(const AgentStateCallback& callback);
-
  protected:
   friend class base::RefCounted<DevToolsAgentHost>;
   virtual ~DevToolsAgentHost() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_DEVTOOLS_AGENT_HOST_H_