Reland of [DevTools] Show icon in top toolbar when Node target is available

content/browser/devtools/protocol/target_handler.h

 // Copyright 2016 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_DEVTOOLS_PROTOCOL_TARGET_HANDLER_H_
 #define CONTENT_BROWSER_DEVTOOLS_PROTOCOL_TARGET_HANDLER_H_
 
 #include <map>
 #include <set>
 
@@ skipping 76 matching lines @@
   void WorkerCreated(ServiceWorkerDevToolsAgentHost* host) override;
   void WorkerReadyForInspection(ServiceWorkerDevToolsAgentHost* host) override;
   void WorkerVersionInstalled(ServiceWorkerDevToolsAgentHost* host) override;
   void WorkerVersionDoomed(ServiceWorkerDevToolsAgentHost* host) override;
   void WorkerDestroyed(ServiceWorkerDevToolsAgentHost* host) override;
 
   // DevToolsAgentHostObserver implementation.
   bool ShouldForceDevToolsAgentHostCreation() override;
   void DevToolsAgentHostCreated(DevToolsAgentHost* agent_host) override;
   void DevToolsAgentHostDestroyed(DevToolsAgentHost* agent_host) override;
+  void DevToolsAgentHostAttached(DevToolsAgentHost* agent_host) override;
+  void DevToolsAgentHostDetached(DevToolsAgentHost* agent_host) override;
 
   // DevToolsAgentHostClient implementation.
   void DispatchProtocolMessage(DevToolsAgentHost* agent_host,
                                const std::string& message) override;
   void AgentHostClosed(DevToolsAgentHost* agent_host,
                        bool replaced_with_another_client) override;
 
   std::unique_ptr<Target::Frontend> frontend_;
   bool discover_;
   bool auto_attach_;
   bool wait_for_debugger_on_start_;
   bool attach_to_frames_;
   RenderFrameHostImpl* render_frame_host_;
   HostsMap attached_hosts_;
   std::set<GURL> frame_urls_;
   RawHostsMap reported_hosts_;
 
   DISALLOW_COPY_AND_ASSIGN(TargetHandler);
 };
 
 }  // namespace protocol
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_PROTOCOL_TARGET_HANDLER_H_